mesa: glGetProgramResourceName

mesa: glGetProgramResourceName

Patch adds required helper functions to shaderapi.h and
the actual implementation.

Name generation copied from '_mesa_get_uniform_name' which can
be removed later by refactoring functions to use resource list.

The added functionality can be tested by tests for following
functions that are refactored by later patches:

   GetActiveUniformName
   GetActiveUniformBlockName

v2: no index for geometry shader inputs (Ilia Mirkin)
    add bufSize < 0 check and error out
    validate enum

corresponding Piglit test:
   arb_program_interface_query-getprogramresourcename

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Martin Peres <martin.peres@linux.intel.org>