Re-add extra_flags

Author: Steelskin

Diff for: .github/workflows/swift-toolchain.yml

@@ -2343,6 +2343,7 @@ jobs:
                 -D CMAKE_SHARED_LINKER_FLAGS="${CMAKE_SHARED_LINKER_FLAGS}" `
                 -D CMAKE_EXE_LINKER_FLAGS_RELEASE="" `
                 -D CMAKE_SHARED_LINKER_FLAGS_RELEASE="" `
+                ${{ matrix.extra_flags }}
                 $CMAKE_NDK_FLAG `
                 $SWIFT_NDK_FLAG `
                 -G Ninja `
@@ -2418,6 +2419,7 @@ jobs:
                 -D CMAKE_SHARED_LINKER_FLAGS="${CMAKE_SHARED_LINKER_FLAGS}" `
                 -D CMAKE_EXE_LINKER_FLAGS_RELEASE="" `
                 -D CMAKE_SHARED_LINKER_FLAGS_RELEASE="" `
+                ${{ matrix.extra_flags }}
                 $CMAKE_NDK_FLAG `
                 $SWIFT_NDK_FLAG `
                 -G Ninja `