* select.cc (thread_pipe): Add paranoid check to ensure thread termination.

* external.cc: Eliminate obsolete include.
* getopt.c (getopt_long): Fix compiler warning.
* shared.h: Moved PID_ definitions to include/sys/cygwin so that they can be
used by external programs.
* include/sys/cygwin.h: Move external definitions here.  Include sys/resource.h
to avoid having to do this everywhere.

winsup/cygwin/libc/getopt.c

@@ -154,7 +154,8 @@ getopt_long(nargc, nargv, options, long_options, index)
 
 	if ((retval = getopt_internal(nargc, nargv, options)) == -2) {
 		char *current_argv = nargv[optind++] + 2, *has_equal;
-		int i, current_argv_len, match = -1;
+		int i, match = -1;
+		size_t current_argv_len;
 
 		if (*current_argv == '\0') {
 			return(-1);