Insulate our HS regex package from confusion with any system-supplied

	one by renaming the header file to "hsregex.h".  The old regex.h
	file has been cvs rm'ed from src/regex and src/include.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80111 13f79535-47bb-0310-9956-ffa450edef68