Revert "_ci-linux-debian.sh: try without explicit install of native libclang-rt-19-dev"

This reverts commit dc732a1.

Nope it's only recommended, which we skip in CI.

Author: vszakats

_ci-linux-debian.sh

@@ -16,6 +16,9 @@ dl=''
 if [[ "${CW_CONFIG:-}" != *'gcc'* ]]; then
   [ -n "${CW_CCSUFFIX:-}" ] || export CW_CCSUFFIX='-19'
   extra+=" llvm${CW_CCSUFFIX} clang${CW_CCSUFFIX} lld${CW_CCSUFFIX}"
+  if [ "${CW_CCSUFFIX}" != '-15' ]; then
+    extra+=" libclang-rt${CW_CCSUFFIX}-dev"
+  fi
 fi
 
 [[ "${CW_CONFIG:-}" = *'boringssl'* ]] && extra+=' golang'