glsl: Record in gl_shader_program whether the program uses GLSL ES.

glsl: Record in gl_shader_program whether the program uses GLSL ES.

Previously we recorded just the GLSL version (or the max version, if
GLSL 1.10 and GLSL 1.20 programs were linked together).

[v2, idr]: s/IsEs(Shader|Prog)/IsES/  Suggested by Ken and Eric.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Acked-by: Carl Worth <cworth@cworth.org>