Merge branch 'jk/ci-macos-gcc13-fix'

CI fix.

* jk/ci-macos-gcc13-fix:
  ci: stop installing "gcc-13" for osx-gcc
  ci: avoid bare "gcc" for osx-gcc job
  ci: drop mention of BREW_INSTALL_PACKAGES variable

.github/workflows/main.yml

@@ -284,8 +284,7 @@ jobs:
             cc: clang
             pool: macos-13
           - jobname: osx-gcc
-            cc: gcc
-            cc_package: gcc-13
+            cc: gcc-13
             pool: macos-13
           - jobname: linux-gcc-default
             cc: gcc

ci/install-dependencies.sh

@@ -69,8 +69,6 @@ macos-*)
 	export HOMEBREW_NO_AUTO_UPDATE=1 HOMEBREW_NO_INSTALL_CLEANUP=1
 	# Uncomment this if you want to run perf tests:
 	# brew install gnu-time
-	test -z "$BREW_INSTALL_PACKAGES" ||
-	brew install $BREW_INSTALL_PACKAGES
 	brew link --force gettext
 
 	mkdir -p "$CUSTOM_PATH"