Simplify logic for skipping libexecinfo unwind test. It works onclang archs except armv7.
Kill sys/cdefs.h includes, because overly complicated include+macrofor a sccsid replacement scheme which results an namespace damageis an unfair tradeok bluhm
Limit regress libexecinfo to amd64 or llvm >=12.Only amd64 has unwind info by default, so this regress test only workson amd64. In llvm12, more architectures have unwind info by default, sothis t
Limit regress libexecinfo to amd64 or llvm >=12.Only amd64 has unwind info by default, so this regress test only workson amd64. In llvm12, more architectures have unwind info by default, sothis test should work on those architectures.Found by bluhm. OK bluhm@
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Move libexecinfo regress tests under regress/gnu/libDiscussed with mortimer@ and bluhm@