mesa: Remove context parameter from _mesa_init_shader_program

mesa: Remove context parameter from _mesa_init_shader_program

Silences:

../../src/mesa/main/shaderobj.c: In function '_mesa_init_shader_program':
../../src/mesa/main/shaderobj.c:239:46: warning: unused parameter 'ctx' [-Wunused-parameter]

For now, this adds a couple other unused parameter warnings, but future
patches will clean those up.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>