dbus: add cmake build dependency

package/dbus/Makefile

@@ -10,7 +10,7 @@ PKG_HASH:=		0ba2a1a4b16afe7bceb2c07e9ce99a8c2c3508e5dec290dbb643384bd6beb7e2
 PKG_DESCR:=		desktop bus daemon
 PKG_SECTION:=		sys/misc
 PKG_DEPENDS:=		libdbus libexpat
-PKG_BUILDDEP:=		expat util-linux
+PKG_BUILDDEP:=		cmake-host expat util-linux
 PKG_NEEDS:=		threads c++
 PKG_URL:=		http://dbus.freedesktop.org/
 PKG_SITES:=		https://dbus.freedesktop.org/releases/dbus/