[NFC][libclc] Set MACRO_ARCH to ${ARCH} uncondionally before customizing (#156789)
Our downstream libclc add a few more targets that customizes build_flags
and opt_flags. Then in each customization block, MACRO_ARCH is defined
to be ${ARCH}.
Hoisting MACRO_ARCH definition out of if-else-end block avoids code
duplication. This also avoids potential error when MACRO_ARCH definition
is forgotten, e.g. in https://github.com/intel/llvm/pull/19971.
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