Small patch to regex.h

[Reuben Thomas]

I noticed that regex.h referred to the non-existent "regex_compile"
when it meant "re_compile_pattern". I have fixed this. The attached
patch also incidentally contains some whitespace cleanup which Emacs
did automatically, where there were 8 spaces instead of TABs. Feel
free to remove this portion of the patch if you like, or apply it
separately (it certainly makes life easier if whitespacing is
consistent within files, as it's enough trouble having different
settings for different code bases).

0001-Fix-a-mention-of-regex_compile-should-be-re_compile_.patch
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