[NFC][libclc] Remove unused -DCLC_INTERNAL build flag, remove unused M_LOG210#156590

wenju-he merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

wenju-he:remove-unused--DCLC_INTERNALwenju-he/llvm-project:remove-unused--DCLC_INTERNALCopy head branch name to clipboard