prune dead code

msvc2013 is not supported any more.

Change-Id: Idca32f77e1b97a219d8bb4571cfd41e7334ac84e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/tools/tools.pri

@@ -127,7 +127,6 @@ else:unix {
 }
 else:win32 {
     SOURCES += tools/qlocale_win.cpp
-    winrt-*-msvc2013: LIBS += advapi32.lib
 } else:integrity {
     SOURCES += tools/qlocale_unix.cpp
 }