THRIFT-343. Import <Foundation/Foundation.h> instead of <Cocoa/Cocoa.h> to support iPhone

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@796327 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/cocoa/src/server/TSocketServer.h b/lib/cocoa/src/server/TSocketServer.h
index 3d4a9e0..e107aaa 100644
--- a/lib/cocoa/src/server/TSocketServer.h
+++ b/lib/cocoa/src/server/TSocketServer.h
@@ -17,7 +17,7 @@
  * under the License.
  */
 
-#import <Cocoa/Cocoa.h>
+#import <Foundation/Foundation.h>
 #import "TProtocolFactory.h"
 #import "TProcessor.h"