XL: Restore suppression of infinite loop warning in process test
Our use of the `-qsuppress=` flag to suppress this warning was removed by commit 51e95ba7 (XL: Fix compatibility with newer clang-based XL on Linux, 2017-04-28) because XL 13.1.[1-6] for Linux does not support the flag. XL 16.1 restores support for the flag. Restore our use of it for this version. Suppress the warning on intermediate versions by blocking all warnings with `-w`.
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