7176644: [macosx] Missing NSAutoreleasePool in CGLGraphicsConfig.m OGLGC_DestroyOGLGraphicsConfig

Summary: Create and drain an autorelease pool
Reviewed-by: anthony, dcherepanov
Contributed-by: NTomas Hurka <tomas.hurka@googlemail.com>

src/macosx/native/sun/java2d/opengl/CGLGraphicsConfig.m

@@ -63,12 +63,14 @@ OGLGC_DestroyOGLGraphicsConfig(jlong pConfigInfo)
 
         CGLCtxInfo *ctxinfo = (CGLCtxInfo *)oglc->ctxInfo;
         if (ctxinfo != NULL) {
+            NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];        
             [NSOpenGLContext clearCurrentContext];
             [ctxinfo->context clearDrawable];
             [ctxinfo->context release];
             if (ctxinfo->scratchSurface != 0) {
                 [ctxinfo->scratchSurface release];
             }
+            [pool drain];
             free(ctxinfo);
         }
     }