sysutils/lxqt-powermanagement: unbreak after 020693c

CMake Error at /usr/local/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
  Could NOT find Perl (missing: PERL_EXECUTABLE)

PR:		266007
Reported by:	antoine (via exp-run)

sysutils/lxqt-powermanagement/Makefile

@@ -13,7 +13,8 @@ LICENSE_FILE=	${WRKSRC}/LICENSE
 RUN_DEPENDS=	upower:sysutils/upower
 
 USES=	cmake compiler:c++14-lang gettext-runtime kde:5 qt:5 \
-	localbase:ldflags lxqt pkgconfig tar:xz gnome xorg
+	localbase:ldflags lxqt perl5 pkgconfig tar:xz gnome xorg
+USE_PERL5=	build
 USE_QT=	buildtools:build qmake:build core svg widgets x11extras \
 	dbus gui xml
 USE_GNOME=	glib20