trurl.sh: link CoreFoundation (for gcc)

Fixing (with gcc only):
```
: && /opt/homebrew/bin/gcc-15 -mmacosx-version-min=10.9 -fno-delete-null-pointer-checks -fno-strict-aliasing -fno-strict-overflow -ftrivial-auto-var-init=zero -fzero-init-padding-bits=all -fno-omit-frame-pointer -mbranch-protection=standard -fvisibility=hidden -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-ident     -Wl,-map,trurl.map  -framework SystemConfiguration -O3 -DNDEBUG -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk -mmacosx-version-min=10.9 -Wl,-search_paths_first -Wl,-headerpad_max_install_names CMakeFiles/trurl.dir/trurl.c.o -o trurl  /Users/runner/work/curl-for-win/curl-for-win/curl/_a64-mac-sys-for-trurl/usr/lib/libcurl.a && :
Undefined symbols for architecture arm64:
  "_CFRelease", referenced from:
      _Curl_macos_init in libcurl.a[77](macos.c.o)
ld: symbol(s) not found for architecture arm64
```
https://github.com/curl/curl-for-win/actions/runs/18807205129/job/53663106319

trurl.sh: link CoreFoundation

Author: vszakats

trurl-gnumake.sh

@@ -47,7 +47,7 @@ _VER="$1"
     if [[ "${_CONFIG}" != *'osnotls'* ]]; then
       LDLIBS+=' -framework Security'
     fi
-    LDLIBS+=' -framework SystemConfiguration'
+    LDLIBS+=' -framework SystemConfiguration -framework CoreFoundation'
   fi
 
   "${_MAKE}" clean

trurl.sh

@@ -54,7 +54,7 @@ _VER="$1"
     if [[ "${_CONFIG}" != *'osnotls'* ]]; then
       LIBS+=' -framework Security'
     fi
-    LIBS+=' -framework SystemConfiguration'
+    LIBS+=' -framework SystemConfiguration -framework CoreFoundation'
   fi
 
   # shellcheck disable=SC2086