package: add PKG_CONF_ENV variables to host packages

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

package/Makefile.autotools.in

@@ -108,6 +108,7 @@ define $(2)_CONFIGURE_CMDS
 	        $$(HOST_CONFIGURE_OPTS) \
 		CFLAGS="$$(HOST_CFLAGS)" \
 		LDFLAGS="$$(HOST_LDFLAGS)" \
+                $$($$(PKG)_CONF_ENV) \
 		./configure \
 		--prefix="$$(HOST_DIR)/usr" \
 		--sysconfdir="$$(HOST_DIR)/etc" \