package: glib: glib-host to explicitly depend on zlib-host

This is required, make sure things won't break if a config is possible
which does not already pull it in via some other dependency.

Signed-off-by: Phil Sutter <phil@nwl.cc>

package/glib/Makefile

@@ -13,7 +13,7 @@ PKG_SECTION:=		libs/misc
 PKG_DEPENDS:=		pcre2 zlib libffi libiconv
 PKG_BUILDDEP:=		glib-host util-linux libffi zlib dbus pcre2 libiconv
 HOST_BUILDDEP:=		pkgconf-host libiconv-host libffi-host python3-host gettext-host util-linux-host
-HOST_BUILDDEP+=		pcre2-host meson-host
+HOST_BUILDDEP+=		pcre2-host meson-host zlib-host
 PKG_NEEDS:=		threads intl iconv
 PKG_URL:=		http://www.gtk.org/
 PKG_SITES:=		http://ftp.gnome.org/pub/GNOME/sources/glib/$(PKG_EXTRAVER)/