glsl: Silence unused parameter warnings

glsl: Silence unused parameter warnings

glsl/standalone_scaffolding.cpp: In function ‘GLbitfield _mesa_program_state_flags(const gl_state_index*)’:
glsl/standalone_scaffolding.cpp:103:66: warning: unused parameter ‘state’ [-Wunused-parameter]
 _mesa_program_state_flags(const gl_state_index state[STATE_LENGTH])
                                                                  ^
glsl/standalone_scaffolding.cpp: In function ‘char* _mesa_program_state_string(const gl_state_index*)’:
glsl/standalone_scaffolding.cpp:109:67: warning: unused parameter ‘state’ [-Wunused-parameter]
 _mesa_program_state_string(const gl_state_index state[STATE_LENGTH])
                                                                   ^
glsl/standalone_scaffolding.cpp: In function ‘void _mesa_delete_shader(gl_context*, gl_shader*)’:
glsl/standalone_scaffolding.cpp:115:40: warning: unused parameter ‘ctx’ [-Wunused-parameter]
 _mesa_delete_shader(struct gl_context *ctx, struct gl_shader *sh)
                                        ^~~
glsl/standalone_scaffolding.cpp: In function ‘void _mesa_delete_linked_shader(gl_context*, gl_linked_shader*)’:
glsl/standalone_scaffolding.cpp:123:47: warning: unused parameter ‘ctx’ [-Wunused-parameter]
 _mesa_delete_linked_shader(struct gl_context *ctx,
                                               ^~~

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>