xapp_mkfontscale: enable compilation for the host and fix deps

mkfontscale on the host is required to build xfonts-encoding for the
target.

We also fix the dependencies. xlib_libX11 is not needed to compile
xapp_mkfontscale. However, xproto_xproto is needed.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/x11r7/xapp_mkfontscale/xapp_mkfontscale.mk

@@ -8,6 +8,8 @@ XAPP_MKFONTSCALE_VERSION = 1.0.5
 XAPP_MKFONTSCALE_SOURCE = mkfontscale-$(XAPP_MKFONTSCALE_VERSION).tar.bz2
 XAPP_MKFONTSCALE_SITE = http://xorg.freedesktop.org/releases/individual/app
 XAPP_MKFONTSCALE_AUTORECONF = NO
-XAPP_MKFONTSCALE_DEPENDENCIES = freetype xlib_libX11 xlib_libfontenc
+XAPP_MKFONTSCALE_DEPENDENCIES = zlib freetype xlib_libfontenc xproto_xproto
+HOST_XAPP_MKFONTSCALE_DEPENDENCIES = host-zlib host-freetype host-xlib_libfontenc host-xproto_xproto
 
 $(eval $(call AUTOTARGETS,package/x11r7,xapp_mkfontscale))
+$(eval $(call AUTOTARGETS,package/x11r7,xapp_mkfontscale,host))