Fix CI not handling Xcode version correctly with packages

In the CI setup, xcode-select is only called after the packages have
been set up, but during setup we actually need to build the packages
from source to have the correct deployment target linked correctly. This
means we could potentially be building with the wrong configuration
(e.g. when building for 10.9 legacy builds, we could be using an Xcode
version that's too new for that) when building gettext/libsodium. This
is compounded by the fact that our GitHub Action cache key for the
libraries only include the formula, but not the active Xcode version
itself so a cache could be propagated for a while until suddenly things
break.

To fix this, first make sure we do Xcode configuration early on in the
build, and to properly use the Xcode version as part of the cache key.
This way, when Xcode version changes, we will invalidate the cache and
rebuild gettext / libsodium with the correct configuration and if that's
wrong we will immediately fail the build instead of using old stale
caches.

Also, bump Xcode from 14.1 to 14.2 in CI.

Author: ychin

.github/actions/universal-package/action.yml

@@ -11,6 +11,7 @@ runs:
   using: 'composite'
   steps:
     - name: Set up formula
+      id: setup-formula
       shell: bash
       run: |
         echo '::group::Set up formula'
@@ -23,14 +24,19 @@ runs:
 
         # Uninstall the already installed formula because we want to build our own
         brew uninstall --ignore-dependencies ${formula} || true
+
+        # Extract Xcode version to serve as part of the key for caching
+        xcode_version=$(xcodebuild -version | tail -1 | sed -E 's/Build version (.*)/\1/')
+        echo "xcode_version=$xcode_version" >> $GITHUB_OUTPUT
+
         echo '::endgroup::'
 
     - name: Cache keg
       id: cache-keg
       uses: actions/cache@v3
       with:
         path: /usr/local/Cellar/${{ inputs.formula }}
-        key: ${{ inputs.formula }}-homebrew-cache-patched-unified-${{ hashFiles(format('{0}.rb', inputs.formula)) }}
+        key: ${{ inputs.formula }}-homebrew-cache-patched-unified-xcode${{ steps.setup-formula.outputs.xcode_version }}-${{ hashFiles(format('{0}.rb', inputs.formula)) }}
 
     - name: Install formula
       shell: bash

.github/workflows/ci-macvim.yaml

@@ -62,7 +62,7 @@ jobs:
 
           # Most up to date OS and Xcode. Used to publish release for the main build.
           - os: macos-12
-            xcode: '14.1'
+            xcode: '14.2'
             publish: true
 
     runs-on: ${{ matrix.os }}
@@ -82,6 +82,13 @@ jobs:
           # Later, we pass the --enable-sparkle_1 flag to configure to set the corresponding ifdef.
           ln -fhs Sparkle_1.framework src/MacVim/Sparkle.framework
 
+      - name: Set up Xcode
+        if: matrix.xcode != ''
+        run: |
+          sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
+          xcode-select -p
+          xcodebuild -version
+
       # Set up, install, and cache gettext library for localization.
       #
       # Instead of using the default binary installed by Homebrew, need to build our own because gettext is statically
@@ -131,12 +138,6 @@ jobs:
             brew unlink perl
           fi
 
-      - name: Set up Xcode
-        if: matrix.xcode != ''
-        run: |
-          sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app/Contents/Developer
-          xcode-select -p
-
       # All set up steps are done. Build and test MacVim below.
 
       - name: Configure