glsl: Silence unused parameter warnings

glsl: Silence unused parameter warnings

I opted to comment out "last_field" because it was not obvious what the
meaning of the dangling bool would be.  For the other parameters, the
meaning was more intuitive without the name.

link_uniform_blocks.cpp:70:65: warning: unused parameter 'name' [-Wunused-parameter]
    virtual void enter_record(const glsl_type *type, const char *name,
                                                                 ^
link_uniform_blocks.cpp:77:65: warning: unused parameter 'name' [-Wunused-parameter]
    virtual void leave_record(const glsl_type *type, const char *name,
                                                                 ^
link_uniform_blocks.cpp:93:62: warning: unused parameter 'record_type' [-Wunused-parameter]
                             bool row_major, const glsl_type *record_type,
                                                              ^
link_uniform_blocks.cpp:94:34: warning: unused parameter 'last_field' [-Wunused-parameter]
                             bool last_field)
                                  ^
link_uniforms.cpp:547:65: warning: unused parameter 'name' [-Wunused-parameter]
    virtual void enter_record(const glsl_type *type, const char *name,
                                                                 ^
link_uniforms.cpp:556:65: warning: unused parameter 'name' [-Wunused-parameter]
    virtual void leave_record(const glsl_type *type, const char *name,
                                                                 ^
link_uniforms.cpp:567:34: warning: unused parameter 'last_field' [-Wunused-parameter]
                             bool last_field)
                                  ^

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Dylan Baker <baker.dylan.c@gmail.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>