Cygwin and Solaris rely on Haiku supplying a glibc-compatible regex.h header.
Before r38031, Solaris was able to reuse cygwin/regex.h successfully. Import
the latest stable 2.11 posix/regex.h to avoid local trickery and to silence
some RE_* errors.
It is very likely necessary to update cygwin/regex.h as well, but I don't have
a test setup to verify.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38096 a95241bf-73f2-0310-859d-f6bbb57e9c96
902e646ceb