configure.ac: bump to version 1.7.92 for the RC1 release
configure.ac: bump to version 1.7.92 for the RC1 release

abooij/wayland,bitfactor/wayland,abooij/wayland,eyolfson/wayland,mchalupa/wayland,eyolfson/wayland,sir-murray/wayland,tulcod/wayland,sir-murray/wayland,abooij/wayland,tulcod/wayland,mchalupa/wayland,bitfactor/wayland,sir-murray/wayland,tulcod/wayland,eyolfson/wayland,bitfactor/wayland,mchalupa/wayland