Merge pull request #14678 from tedsteiner:qnx

Fix build issue on QNX platform (#14678)

* QNX compatibility

* core: unify gettimeofday() usage

modules/core/src/system.cpp

@@ -758,8 +758,7 @@ int64 getTickCount(void)
     return (int64)mach_absolute_time();
 #else
     struct timeval tv;
-    struct timezone tz;
-    gettimeofday( &tv, &tz );
+    gettimeofday(&tv, NULL);
     return (int64)tv.tv_sec*1000000 + tv.tv_usec;
 #endif
 }