libffi: enable host target

libffi is a new requirement for libglib, and as libglib has to be built
for the host as well, libffi has to follow.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libffi/libffi.mk

@@ -32,4 +32,5 @@ endef
 LIBFFI_POST_INSTALL_TARGET_HOOKS += LIBFFI_MOVE_TARGET_HEADERS
 
 $(eval $(call AUTOTARGETS))
+$(eval $(call AUTOTARGETS,host))