fixes for Clang builtins when compiling Emacs on Fedora

[Paul Eggert]

I had a couple of problems with the recent Clang-related fixes on Fedora 31 when 
building Emacs, and worked around them by installing the attached patches, which 
I hope are reasonably self-explanatory.

Fedora 31 uses Clang 9, and if the seeming Clang bugs/incompatibilities are 
fixed in later Clang versions I suppose we can do better there.

0001-libc-config-avoid-Clang-s-__diagnose_if__.patch
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0002-verify-avoid-__built_assume-on-Clang.patch
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