Fix builds where HAVE_C___ATOMIC is not defined. #12240
Merged
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Summary
build/m4/ax_c___atomic.m4
wrongly skips setting HAVE_C___ATOMIC on some 32-bit platforms.This breaks C++ 11 code because of the definition of
rrdset_flag_set
.Test Plan
CI jobs & local builds after undef-ing the aforementioned macro.