[packages] glib2: disable selinux for host-build

fix Fedora 20 build error:
/usr/lib/gcc/i686-redhat-linux/4.8.2/../../../libselinux.so: undefined reference to `lzma_stream_decoder@XZ_5.0'
/usr/lib/gcc/i686-redhat-linux/4.8.2/../../../libselinux.so: undefined reference to `lzma_end@XZ_5.0'
/usr/lib/gcc/i686-redhat-linux/4.8.2/../../../libselinux.so: undefined reference to `lzma_code@XZ_5.0'

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>