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libuv upstream commit `4a972bf0` (aix: Fix broken cmpxchgi() XL C++
specialization., 2019-09-06, v1.32.0~5) broke compilation with this
compiler. According to
https://www.ibm.com/support/knowledgecenter/SSGH3R_16.1.0/com.ibm.xlcpp161.aix.doc/migrate/migrate_to_xlclang.html
XLClang 16.1 for AIX does not support `__sync_val_compare_and_swap`.
The documentation suggests using C++11 atomic operations instead, but
this is C code. For now fall back to the non-atomic equivalent used
before so we can at least compile. Add a FIXME comment for this.