Fixes broken pod build and ignores the header file on macs BradLarson#2591

Author: rushairer

GPUImage.podspec

@@ -18,6 +18,7 @@ Pod::Spec.new do |s|
 
   s.osx.deployment_target = '10.6'
   s.osx.exclude_files = 'framework/Source/iOS',
+          		        'framework/Source/GPUImage.h',
                         'framework/Source/GPUImageFilterPipeline.*',
                         'framework/Source/GPUImageMovieComposition.*',
                         'framework/Source/GPUImageVideoCamera.*',