Deprecate qrand/qsrand

They have been marked as deprecated in the documentation for a while

Change-Id: Ia2b0b6dbd4c525e3e9c4bc835eee2c9da5a938cb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

Author: tsdgeos

src/corelib/global/qglobal.h

@@ -1266,8 +1266,10 @@ inline int qIntCast(float f) { return int(f); }
 /*
   Reentrant versions of basic rand() functions for random number generation
 */
-Q_CORE_EXPORT void qsrand(uint seed);
-Q_CORE_EXPORT int qrand();
+#if QT_DEPRECATED_SINCE(5, 15)
+Q_CORE_EXPORT QT_DEPRECATED_VERSION_X_5_15("use QRandomGenerator instead") void qsrand(uint seed);
+Q_CORE_EXPORT QT_DEPRECATED_VERSION_X_5_15("use QRandomGenerator instead") int qrand();
+#endif
 
 #define QT_MODULE(x)