configure.ac: bump version to 1.7.90
configure.ac: bump version to 1.7.90

Master is open for new features again

Signed-off-by: Bryce Harrington <bdb14cfc1ab8d24e13de84adc40b41ae60c13bd1@osg.samsung.com>

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