build-sys: bump libtool version information
build-sys: bump libtool version information

As one interface was added bump the version and put a comment to avoid
too much updates.

Signed-off-by: Frediano Ziglio <55d48b080b2e443e395cde84d2c83b135a4ff48e@redhat.com>

SPICE/spice,fgouget/spice,ya-mouse/spice,fgouget/spice,ya-mouse/spice,fgouget/spice,fgouget/spice,SPICE/spice,ya-mouse/spice,SPICE/spice