gvfs: fix build

error message was for build from scratch and latest heads:

| ERROR: This autoconf log indicates errors, it looked at host include and/or library paths while determining system capabilities.
| Rerun configure task after fixing this. The path was '/home/Superandy/tmp/oe-core-eglibc/work/armv7a-vfp-neon-angstrom-linux-gnueabi/gvfs-1.8.2-r7.0/gvfs-1.8.2'
| ERROR: Function failed: do_qa_configure

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>