* lib/getopt.c: Use __progname==__argv[0] when not compiling for cygwin.

* scandir.cc (scandir): Use correct default when compar == NULL.

winsup/cygwin/lib/getopt.c

@@ -68,6 +68,9 @@ char    *optarg;		/* argument associated with option */
 __weak_alias(getopt_long,_getopt_long)
 #endif
 
+#ifndef __CYGWIN__
+#define __progname __argv[0]
+#endif
 
 #define IGNORE_FIRST	(*options == '-' || *options == '+')
 #define PRINT_ERROR	((opterr) && ((*options != ':') \