x11-clocks/ktimer: pacify stage-qa after fca1356

Error: /usr/local/bin/ktimer is linked to /usr/local/lib/libX11.so.6 from x11/libX11 but it is not declared as a dependency
Warning: you need USE_XORG+=x11

Reported by:	portscan

x11-clocks/ktimer/Makefile

@@ -7,7 +7,7 @@ MAINTAINER=	kde@FreeBSD.org
 COMMENT=	Countdown launcher for KDE
 WWW=		https://utils.kde.org/projects/ktimer/
 
-USES=		cmake compiler:c++11-lang gettext kde:5 qt:5 tar:xz
+USES=		cmake compiler:c++11-lang gettext kde:5 qt:5 tar:xz xorg
 USE_KDE=	auth codecs completion config configwidgets coreaddons \
 		dbusaddons doctools i18n iconthemes jobwidgets kio \
 		notifications service solid widgetsaddons windowsystem xmlgui \