mesa: Set api prefix to version string when overriding version
Otherwise there are problems when user overrides version and application
such as Piglit wants to detect used api with glGetString(GL_VERSION).
This makes it currently impossible to run glslparsertest tests for
OpenGL ES when using version override.
Below is example when using MESA_GLES_VERSION_OVERRIDE=3.1.
Before:
"3.1 Mesa 11.1.0-devel (git-24a1a15)"
After:
"OpenGL ES 3.1 Mesa 11.1.0-devel (git-78042ff)"
v2: only include api prefix for OpenGL ES (Boyan Ding)
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Cc: "11.0" <mesa-stable@lists.freedesktop.org>