Release notes:
https://github.com/KhronosGroup/glslang/releases/tag/15.4.0
https://github.com/KhronosGroup/glslang/releases/tag/16.0.0
Updated license hash due to upstream commit:
e70645c457
Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Julien Olivain <ju.o@free.fr>