Switch getopt example to getprogname()

[Tristan Le Guern]

Hi,

This patch for /usr/share/misc/getopt enforces the use of getprogname()
instead of __progname.

Is this desirable? If so I also have a patch for style(9).

Index: getopt
===================================================================
RCS file: /cvs/src/share/misc/getopt,v
retrieving revision 1.8
diff -u -p -r1.8 getopt
--- getopt	1 Feb 2006 09:27:28 -0000	1.8
+++ getopt	29 Apr 2014 09:29:27 -0000
@@ -40,8 +40,6 @@ main(int argc, char *argv[])
 void
 usage(void)
 {
-	extern char *__progname;
-
-	(void)fprintf(stderr, "usage: %s [-b] [-f file]\n", __progname);
+	(void)fprintf(stderr, "usage: %s [-b] [-f file]\n", getprogname());
 	exit(1);
 }