[libc++] Prevent stale site configuration headers If we define cmake macros that require a site config, and then undefine all such macros, a stale site config header will be left behind. Explicitly delete any generate site config if we don't need one to avoid this. Differential Revision: https://reviews.llvm.org/D36720 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@313284 91177308-0d34-0410-b5e6-96231b3b80d8 
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