libxshmfence: Changes to 'master'

[Adam Jackson]

 configure.ac |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

New commits:
commit 0b550a4e7acf02d3478602848f6afbfcbfb0d4b2
Author: Ross Burton <ross.burton at intel.com>
Date:   Mon Jan 29 16:24:36 2018 +0000

    configure.ac: call AC_USE_SYSTEM_EXTENSIONS
    
    With glibc 2.27 memfd_create() is inside a _GNU_SOURCE guard, so call
    AC_USE_SYSTEM_EXTENSIONS to get this defined.
    
    Signed-off-by: Ross Burton <ross.burton at intel.com>

commit 1f194603cb927352c42798bead29c8ac3a680d02
Author: Adam Jackson <ajax at redhat.com>
Date:   Thu Dec 14 14:31:17 2017 -0500

    configure: Nerf a thing
    
    Signed-off-by: Adam Jackson <ajax at redhat.com>