enable c-ares by default in curl 8.12.0 for HTTPS RR support [ci skip]

Replace `noh3` alternative build example with `nocares`.

Size increase is about 200 KiB for the distro `.zip` and `.tar.gz`
files, and about the same amount for `curl.exe` and `libcurl*.dll`.
c-ares static lib is 440 KiB in size (on Windows).

This is not small, but fine. The bigger issue is that c-ares needs
patching to build correctly and it's also unclear if it breaks the
binary on supported systems back to Windows Vista.

[EXPERIMENTAL]

Author: vszakats

README.md

@@ -67,38 +67,38 @@ Uses [LibreSSL](https://www.libressl.org/) TLS backend.
 ```
 Windows:
 Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp ws wss
-Features: alt-svc AsynchDNS brotli CAcert HSTS HTTP2 HTTP3 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL SSPI SSLS-EXPORT threadsafe UnixSockets zstd
+Features: alt-svc asyn-rr AsynchDNS brotli CAcert HSTS HTTP2 HTTP3 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL SSPI SSLS-EXPORT threadsafe UnixSockets zstd
 
 macOS:
 Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp ws wss
-Features: alt-svc AsynchDNS brotli CAcert HSTS HTTP2 HTTP3 HTTPS-proxy IDN IPv6          Largefile libz NTLM PSL        SSL      SSLS-EXPORT threadsafe UnixSockets zstd
+Features: alt-svc asyn-rr AsynchDNS brotli CAcert HSTS HTTP2 HTTP3 HTTPS-proxy IDN IPv6          Largefile libz NTLM PSL        SSL      SSLS-EXPORT threadsafe UnixSockets zstd
 
 Linux:
 Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns            mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp ws wss
-Features: alt-svc AsynchDNS brotli CAcert HSTS HTTP2 HTTP3 HTTPS-proxy     IPv6          Largefile libz NTLM PSL        SSL      SSLS-EXPORT threadsafe UnixSockets zstd
+Features: alt-svc asyn-rr AsynchDNS brotli CAcert HSTS HTTP2 HTTP3 HTTPS-proxy     IPv6          Largefile libz NTLM PSL        SSL      SSLS-EXPORT threadsafe UnixSockets zstd
 ```
 <details><summary>Alternate configurations:</summary><p>
 
 ```
-"noh3", HTTP/2:
+"nocares", HTTP/2:
 Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp ws wss
-Features: alt-svc AsynchDNS brotli CAcert HSTS HTTP2       HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL SSPI SSLS-EXPORT threadsafe UnixSockets zstd
+Features: alt-svc         AsynchDNS brotli CAcert HSTS HTTP2 HTTP3 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL SSPI SSLS-EXPORT threadsafe UnixSockets zstd
 
 "mini", without brotli and zstd, with OS TLS backend (Schannel, SecureTransport) if available:
 Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp ws wss
-Features: alt-svc AsynchDNS        CAcert HSTS HTTP2       HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL SSPI             threadsafe UnixSockets
+Features: alt-svc         AsynchDNS        CAcert HSTS HTTP2       HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL SSPI             threadsafe UnixSockets
 
 "micro", without libssh2:
 Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtsp          smb smbs smtp smtps telnet tftp ws wss
-Features: alt-svc AsynchDNS        CAcert HSTS HTTP2       HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL SSPI             threadsafe UnixSockets
+Features: alt-svc         AsynchDNS        CAcert HSTS HTTP2       HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL SSPI             threadsafe UnixSockets
 
 "nano", HTTP/1.1:
 Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtsp          smb smbs smtp smtps telnet tftp ws wss
-Features:         AsynchDNS        CAcert HSTS             HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL SSPI             threadsafe UnixSockets
+Features:                 AsynchDNS        CAcert HSTS             HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM PSL SPNEGO SSL SSPI             threadsafe UnixSockets
 
 "pico", HTTP/1.1-only:
 Protocols:                                   http https
-Features:         AsynchDNS        CAcert HSTS             HTTPS-proxy     IPv6          Largefile libz      PSL        SSL                  threadsafe
+Features:                 AsynchDNS        CAcert HSTS             HTTPS-proxy     IPv6          Largefile libz      PSL        SSL                  threadsafe
 ```
 </p></details>
 

_build.sh

@@ -38,6 +38,7 @@ set -o xtrace -o errexit -o nounset; [ -n "${BASH:-}${ZSH_NAME:-}" ] && set -o p
 #        nobrotli   build without brotli
 #        nozstd     build without zstd
 #        nozlib     build without zlib
+#        nocares    build without c-ares
 #        noftp      build without FTP/FTPS support
 #        nohttp     build without HTTP and proxy support
 #        nocookie   build without cookie support

_dl.sh

@@ -672,8 +672,16 @@ if [[ ! "${_CONFIG}" =~ (zero|bldtst|pico|nano|micro|mini) ]]; then
   fi
 fi
 
-if [[ "${_CONFIG}" = *'cares'* ]]; then
-  _DEPS+=' cares'
+if [[ "${_CONFIG}" = *'dev'* ]]; then
+  if [[ ! "${_CONFIG}" =~ (zero|bldtst|pico|nano|micro|mini) || "${_CONFIG}" = *'cares'* ]]; then
+    if [[ "${_CONFIG}" != *'nocares'* ]]; then
+      _DEPS+=' cares'
+    fi
+  fi
+else
+  if [[ "${_CONFIG}" = *'cares'* ]]; then
+    _DEPS+=' cares'
+  fi
 fi
 
 if [[ ! "${_CONFIG}" =~ (zero|bldtst|nocookie) ]]; then