AVFoundation: Improve config test

This should prevent the avfoundation plugin from being built on system
that can not support using it (ex. 32bit builds on OS X 10.7)

Task-number: QTBUG-36239
Change-Id: I9f861b7580b0e015ddbc1231440d677bf6eee1ec
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

config.tests/avfoundation/avfoundation.pro

@@ -1,3 +1,3 @@
 OBJECTIVE_SOURCES += main.mm
 
-LIBS += -framework AVFoundation
+LIBS += -framework AVFoundation -framework Foundation

config.tests/avfoundation/main.mm

@@ -39,9 +39,11 @@
 **
 ****************************************************************************/
 
+#import <Foundation/Foundation.h>
 #import <AVFoundation/AVFoundation.h>
 
 int main(int argc, char** argv)
 {
+    AVPlayer *player = [AVPlayer playerWithURL:[NSURL URLWithString:@"http://doesnotmatter.com"]];
     return 0;
 }