ci: Move the build cflags to a meson native file

Similar to what we use for the werror

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5543>

.gitlab-ci.yml

@@ -40,13 +40,6 @@ variables:
   WINDOWS_IMAGE: "$CI_REGISTRY_IMAGE/$WINDOWS_AMD64_SUFFIX:$WINDOWS_TAG-$GST_UPSTREAM_BRANCH"
   WINDOWS_UPSTREAM_IMAGE: "$CI_REGISTRY/$FDO_UPSTREAM_REPO/$WINDOWS_AMD64_SUFFIX:$WINDOWS_TAG-$GST_UPSTREAM_BRANCH"
 
-  _CI_CFLAGS: >-
-    -Wno-error=deprecated-declarations
-    -ggdb
-    -fasynchronous-unwind-tables
-    -fno-omit-frame-pointer
-    -mno-omit-leaf-frame-pointer
-
   DEFAULT_MESON_ARGS: >-
     -Dlibnice:tests=disabled
     -Dlibnice:examples=disabled

ci/meson/gst-ci-cflags.ini

@@ -0,0 +1,3 @@
+[built-in options]
+c_args = [ '-Wno-error=deprecated-declarations', '-ggdb', '-fno-omit-frame-pointer', '-mno-omit-leaf-frame-pointer', '-fasynchronous-unwind-tables']
+cpp_args = c_args

ci/scripts/build.sh

@@ -28,7 +28,7 @@ if [ "$GST_WERROR" = "true" ]; then
 fi
 
 date -R
-meson setup build/ -Dc_args="${_CI_CFLAGS}" -Dcpp_args="${_CI_CFLAGS}" ${ARGS}
+meson setup build/ --native-file ./ci/meson/gst-ci-cflags.ini  ${ARGS}
 date -R
 meson compile -C build/
 date -R