musa: remove Clang builtins mapping #9421
                
     Merged
            
            
          
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This follow-up PR removes the Clang builtins mapping from PR #8383. MUSA compiler (mcc) now supports
__vsubss4,__vsub4,__vcmpeq4,__vcmpne4and etc.Testing done:
make GGML_MUSA=1-> passed