[WASM] Fix CoreFoundation installation script.

Move CoreFoundation dir into root swift_static
Move Foundation swiftmodules into swift_static manually

Author: kateinoigakukun

utils/webassembly/build-foundation.sh

@@ -20,3 +20,16 @@ cmake -G Ninja \
 
 ninja -v
 ninja -v install
+
+# On macOS the target CoreFoundation shadows the CoreFoundation suppplied by Xcode.
+# On Linux though there's no system CoreFoundation, its headers have to be shipped
+# in the installable archive and serve for both host and target.
+if [[ "$(uname)" == "Darwin" ]]; then
+  mv $DESTINATION_TOOLCHAIN/usr/lib/swift/CoreFoundation \
+    $DESTINATION_TOOLCHAIN/usr/lib/swift_static/CoreFoundation
+
+  mv $DESTINATION_TOOLCHAIN/usr/lib/swift/wasi/wasm32/Foundation.swiftmodule \
+    $DESTINATION_TOOLCHAIN/usr/lib/swift_static/wasi/wasm32/Foundation.swiftmodule
+  mv $DESTINATION_TOOLCHAIN/usr/lib/swift/wasi/wasm32/Foundation.swiftdoc \
+    $DESTINATION_TOOLCHAIN/usr/lib/swift_static/wasi/wasm32/Foundation.swiftdoc
+fi