Change c files to cpp

Summary: Changed the extensions of c files to cpp and made the project build successfully

Reviewed By: gkassabli

Differential Revision: D6271299

fbshipit-source-id: 66c0e54ccf019d72d1fd0b4d117826e4e84fdc89

Yoga.podspec

@@ -21,8 +21,8 @@ Pod::Spec.new do |spec|
       '-fexceptions',
       '-Wall',
       '-Werror',
-      '-std=c11',
+      '-std=c++1y',
       '-fPIC'
   ]
-  spec.source_files = 'yoga/**/*.{c,h}'
+  spec.source_files = 'yoga/**/*.{c,h,cpp}'
 end