THRIFT-2180 Integer types issues in Cocoa lib on ARM64

CLient: Cocoa
Patch: Jeremy W. Sherman
This closes #372
diff --git a/lib/cocoa/src/transport/TSocketClient.h b/lib/cocoa/src/transport/TSocketClient.h
index 372850f..81a0247 100644
--- a/lib/cocoa/src/transport/TSocketClient.h
+++ b/lib/cocoa/src/transport/TSocketClient.h
@@ -28,7 +28,7 @@
 }
 
 - (id) initWithHostname: (NSString *) hostname
-                   port: (int) port;
+                   port: (UInt32) port;
 
 @end