CURLBindings: Prevent GC from deadlocking in some cases

The idea here is to avoid GC during these instructions since it seems to create some deadlock? I think this solves part of the issue.

project/src/net/curl/CURLBindings.cpp

@@ -2502,7 +2502,8 @@ namespace lime {
 
 
 	int lime_curl_multi_perform (value multi_handle) {
-
+
+		hx::EnterGCFreeZone();
 		curl_gc_mutex.Lock ();
 
 		int runningHandles = 0;
@@ -2521,7 +2522,8 @@ namespace lime {
 		curlMultiRunningHandles[multi_handle] = runningHandles;
 
 		curl_gc_mutex.Unlock ();
-
+		hx::ExitGCFreeZone();
+
 		return result;
 
 	}
@@ -2889,4 +2891,4 @@ extern "C" int lime_curl_register_prims () {
 
 	return 0;
 
-}
+}