Compile rtc_base_objc and rtc_api_objc for Mac

webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_objc.mm

Index: webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_objc.mm
diff --git a/webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_objc.mm b/webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_objc.mm
index 8a6d448a9335ee3ebe8fd2966df13b862fedb03f..f83fe2d3726b909a1b2617fcac7bf6ad178e7a5e 100644
--- a/webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_objc.mm
+++ b/webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_objc.mm
@@ -24,6 +24,9 @@ using namespace videocapturemodule;
 
 @implementation VideoCaptureMacQTKitObjC
 
+// TODO(hjon): Update deprecated APIs (see webrtc:5478 for details).
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated"
 -(id)init {
   self = [super init];
   if (self) {
@@ -256,5 +259,6 @@ using namespace videocapturemodule;
   _framesDelivered++;
   _framesRendered++;
 }
+#pragma clang diagnostic pop
 
 @end