Regex library derived from FreeBSD-2.2.5R.

I have modified like follows.

All files:
	#include <regex.h> -> #include "regex.h"
	delete __P()
regcomp.c:
	following code added.

	#ifndef BSD4_4
	int __collate_range_cmp (c1, c2)
	int c1;
	int c2;
	{
	      return c1 - c2;
	}
	#ifndef isblank
	#define isblank(c)    ((c) == ' ' || (c) == '\t')
	#endif
	#endif
