[PATCH] Reorganize inclusions in regex

[Bonzini]

The attached patch moves to regex_internal.h the inclusions that are common
to all the regex C source files, and ensures that regex.h can be included
when only sys/types.h has been included.

Since I was at it, I also conditionalized the inclusion of locale.h on
HAVE_LOCALE_H || _LIBC.

|_  _  _ __
|_)(_)| ),'
------- '---
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