utils/: Split compiler-version macros into a separate header.
authorMark Wooding <mdw@distorted.org.uk>
Sat, 26 May 2018 15:18:43 +0000 (16:18 +0100)
committerMark Wooding <mdw@distorted.org.uk>
Sat, 26 May 2018 15:19:34 +0000 (16:19 +0100)
This way we can use them in other headers without the namespace mess of
`macros.h'.

Also, actually document `CLANG_VERSION_P'.


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