gdbus-example-unix-fd-client: avoid strftime %c specifier
gdbus-example-unix-fd-client: avoid strftime %c specifier

gcc 6 warns (fatally, by default) that %c only uses a 2-digit year
in some locales. The precise format does not seem to be important
for this sample code, so use ISO 8601 instead of suppressing the
warning with a pragma.

Signed-off-by: Simon McVittie <0e1aea601907c1a85c2dc96e5ea37e23c58d2e9b@debian.org>
Reviewed-by: Colin Walters
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=768453

johne53/MB3Glib,johne53/MB3Glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,johne53/MB3Glib,endlessm/glib,johne53/MB3Glib,endlessm/glib,endlessm/glib,endlessm/glib