graphics/mesa-devel: unbreak X11=off build

meson.build:380:3: ERROR: Feature xlib-lease cannot be enabled: xlib-lease requires X11 and KMS/DRM support

graphics/mesa-devel/Makefile

@@ -147,7 +147,7 @@ WAYLAND_VARS=		PLATFORMS+=wayland
 X11_USES=		xorg
 X11_USE=		XORG=x11,xcb,xdamage,xext,xfixes,xorgproto,xrandr,xshmfence,xxf86vm
 X11_VARS=		PLATFORMS+=x11
-X11_MESON_OFF=		-Dglx=disabled
+X11_MESON_OFF=		-Dglx=disabled -Dxlib-lease=disabled
 
 ZSTD_DESC=		Use ZSTD for shader cache
 ZSTD_LIB_DEPENDS=	libzstd.so:archivers/zstd