some OSes use _REGEX_H_ as their inclusion guard for system regex headers; therefore, rather use _PG_REGEX_H_ in pg_regex.h, which is also consistent with the filename
git-svn-id: https://crux.nu/svn/tools/prt-get/trunk@9 0b5ae1c7-2405-0410-a7fc-ba219f786e1e