Compile rtc_base_objc and rtc_api_objc for Mac

webrtc/base/proxydetect.cc

Index: webrtc/base/proxydetect.cc
diff --git a/webrtc/base/proxydetect.cc b/webrtc/base/proxydetect.cc
index 30959ca1d3f14198cd14597140e9a51cc9ad814e..1374284f269664183fd1d5b7e6bb106cfd2f083a 100644
--- a/webrtc/base/proxydetect.cc
+++ b/webrtc/base/proxydetect.cc
@@ -391,6 +391,9 @@ bool GetFirefoxProfilePath(Pathname* path) {
   path->AppendFolder("Mozilla");
   path->AppendFolder("Firefox");
 #elif defined(WEBRTC_MAC) && !defined(WEBRTC_IOS)
+// TODO(5478): Update deprecated APIs.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated"
   FSRef fr;
   if (0 != FSFindFolder(kUserDomain, kApplicationSupportFolderType,
                         kCreateFolder, &fr)) {
@@ -405,6 +408,7 @@ bool GetFirefoxProfilePath(Pathname* path) {
   }
   path->SetFolder(std::string(buffer));
   path->AppendFolder("Firefox");
+#pragma clang diagnostic pop
 #else
   char* user_home = getenv("HOME");
   if (user_home == NULL) {