gettext-full: add gmsgfmt symlink in host install

Some configure scripts look for msgfmt and gmsgfmt. As we don't install
the latter, configure might pick up one from staging_dir/hostpkg, and
the other from the host:

checking for msgfmt... /home/stijn/Development/OpenWrt/openwrt/staging_dir/hostpkg/bin/msgfmt
checking for gmsgfmt... /usr/bin/gmsgfmt

This could potentially lead to hard to debug undefined behaviour.
Install a symlink in the host install phase to avoid this.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

package/libs/gettext-full/Makefile

@@ -88,6 +88,11 @@ define Build/InstallDev
 	$(SED) '/read dummy/d' $(STAGING_DIR_HOSTPKG)/bin/gettextize
 endef
 
+define Host/Install
+	$(call Host/Install/Default)
+	$(LN) msgfmt $(STAGING_DIR_HOSTPKG)/bin/gmsgfmt
+endef
+
 define Package/libintl-full/install
 	$(INSTALL_DIR) $(1)/usr/lib
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libintl.so.* $(1)/usr/lib/