allow to skip check for mdds in bundled projects

PKG_CHECK_MODULES requires both _CFLAGS and _LIBS to be set to skip the
check.

Change-Id: Ia4ae0576f186eb0c002c40bdb66f3a11a972a0c3

config_host.mk.in

@@ -389,6 +389,7 @@ export LIBMARIADB_PATH=@LIBMARIADB_PATH@
 export BUNDLE_MARIADB=@BUNDLE_MARIADB@
 export MD5SUM=@MD5SUM@
 export MDDS_CFLAGS=$(gb_SPACE)@MDDS_CFLAGS@
+export MDDS_LIBS=$(gb_SPACE)@MDDS_LIBS@
 export MERGELIBS=@MERGELIBS@
 export MINGWCXX=@MINGWCXX@
 export MINGWSTRIP=@MINGWSTRIP@