Build: Fix Android/macOS ccache.

.github/workflows/build.yml

@@ -238,8 +238,20 @@ jobs:
         CXX: ${{ matrix.cxx }}
         NDK: ${{ steps.setup-ndk.outputs.ndk-path }}
         NDK_CCACHE: ccache
+        USE_CCACHE: 1
       run: |
         export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+        export CCACHE_SLOPPINESS=clang_index_store,ivfsoverlay,include_file_ctime,include_file_mtime,modules,system_headers,time_macros
+        if [ "${{ matrix.extra }}" == "android" ]; then
+          export CCACHE_FILECLONE=true
+          export CCACHE_DEPEND=true
+          export CCACHE_COMPILERCHECK=content
+        elif [ "$RUNNER_OS" == "macOS" ]; then
+          export CCACHE_SLOPPINESS=pch_defines,$CCACHE_SLOPPINESS
+          export CCACHE_FILECLONE=true
+          export CCACHE_DEPEND=true
+          export CCACHE_COMPILERCHECK=content
+        fi
         ${{ matrix.args }}
 
     - name: Package build