st/mesa: added PROGRAM_LOCAL_PARAM case in src_register()

Fixes piglit vpfp-generic arl.vpfp failure when using gallium.

src/mesa/state_tracker/st_mesa_to_tgsi.c

@@ -174,6 +174,7 @@ src_register( struct st_translate *t,
    case PROGRAM_STATE_VAR:
    case PROGRAM_NAMED_PARAM:
    case PROGRAM_ENV_PARAM:
+   case PROGRAM_LOCAL_PARAM:
    case PROGRAM_UNIFORM:
    case PROGRAM_CONSTANT:       /* ie, immediate */
       return t->constants[index];