haserl: fix lua support build on hosts without lua development package

Abuse lua2c_LDFLAGS to pass the correct host cflags/ldflags when lua2c
is built for the host.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/haserl/haserl.mk

@@ -10,7 +10,9 @@ HASERL_SITE = http://$(BR2_SOURCEFORGE_MIRROR).dl.sourceforge.net/sourceforge/ha
 ifeq ($(BR2_PACKAGE_HASERL_WITH_LUA),y)
 	HASERL_CONF_OPT += --with-lua=$(STAGING_DIR) \
 		--with-lua-headers=$(STAGING_DIR)
-	HASERL_DEPENDENCIES += lua
+	HASERL_DEPENDENCIES += lua host-lua
+	# lua2c is built for host, so needs to find host libs/headers
+	HASERL_MAKE_OPT += lua2c_LDFLAGS='$(HOST_CFLAGS) $(HOST_LDFLAGS)'
 endif
 
 define HASERL_REMOVE_EXAMPLES