doc/features.txt: factor out radeonsi as GL45 complete
doc/features.txt: factor out radeonsi as GL45 complete

V2. add i965/hsw+ to list
V3. rebased on master.
V4. 'DONE' -> 'DONE ()'.
V5. remove i965/hsw+ from list :/

Signed-off-by: Edward O'Callaghan <b035da0d7e151e09fe2005f3a7bc526beb9b3245@folklore1984.net>
Reviewed-by: Marek Olšák <8c7344a1abdb103e79ecfd488098373070c3c70e@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler