gettext: provide a host variant

In preparation for the removal of gettext as a hard dependency, we
need to be able to provide a host variant of gettext for the few
packages that require msgfmt.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/gettext/gettext.mk

@@ -56,3 +56,4 @@ GETTEXT_POST_PATCH_HOOKS += GETTEXT_DISABLE_TOOLS
 GETTEXT_POST_PATCH_HOOKS += GETTEXT_DISABLE_TESTS
 
 $(eval $(autotools-package))
+$(eval $(host-autotools-package))