Revert "ci: Disable optimization on macos-12"

This reverts commit 1f76b5365e.

There were two issues with this commit.  First is the missing propagation
of CFLAGS into the build environment and second is the fact that this is
not enough to disable the check for -fsemantic-interposition.  The
proper fix would require setting MESON_OPTS or similar and also add the
propagation of such variable into the cirrus builds etc., but at this
point I burned so much time on this trivial piece of rubbish that I
think it's easier to just wait for macos to gain a newer clang =D

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

ci/gitlab/builds.yml

@@ -865,7 +865,6 @@ aarch64-macos-12:
   needs: []
   allow_failure: false
   variables:
-    CFLAGS: -O0
     CIRRUS_VM_IMAGE_NAME: ghcr.io/cirruslabs/macos-monterey-base:latest
     CIRRUS_VM_IMAGE_SELECTOR: image
     CIRRUS_VM_INSTANCE_TYPE: macos_instance

ci/manifest.yml

@@ -179,8 +179,6 @@ targets:
         variables:
           PATH_EXTRA: /usr/local/opt/ccache/libexec:/usr/local/opt/gettext/bin:/usr/local/opt/libpcap/bin:/usr/local/opt/libxslt/bin:/usr/local/opt/rpcgen/bin
           PKG_CONFIG_PATH: /usr/local/opt/curl/lib/pkgconfig:/usr/local/opt/libpcap/lib/pkgconfig:/usr/local/opt/libxml2/lib/pkgconfig:/usr/local/opt/ncurses/lib/pkgconfig:/usr/local/opt/readline/lib/pkgconfig
-          # Remove once macos has clang with -fsemantic-interposition
-          CFLAGS: -O0
 
   ubuntu-2004:
     jobs: