* Makefile.in (VPATH): Add regex directory.

(NM): new variable.
(OBSOLETE_FUNCTIONS): Ditto.
(NEW_FUNCTIONS): Ditto.
(install-headers): Install regex.h.
(install-man): New target.
(install): Use new target.
(DLL_OFILES): Add v8_reg* stuff.
(new-cygwin1.dll): Eliminate stamp-cygwin-lib creation.
(libcygwin.a): Remove obsolete functions from import lib.  Add new functions.
* configure.in: Detect 'nm' tool.
* configure: Regenerate.
* cygwin.din: Export posix_reg* functions.  Eliminate export of v8 reg*
functions.  This is now handled in object files themselves.
* regex/*: New files.
* regexp/v8_*.c: New files, renamed from non v8_ equivalents.

winsup/cygwin/cygwin.din

@@ -594,16 +594,10 @@ readv
 _readv = readv
 realloc = export_realloc
 _realloc = export_realloc
-regcomp
-_regcomp = regcomp
-regexec
-_regexec = regexec
-regerror
-_regerror = regerror
-regfree
-_regfree = regfree
-regsub
-_regsub = regsub
+posix_regcomp
+posix_regerror
+posix_regexec
+posix_regfree
 remainder
 _remainder = remainder
 remainderf
@@ -910,6 +904,7 @@ wctomb
 _wctomb = wctomb
 write
 _write = write
+barfly = write
 writev
 _writev = writev
 y0