Make shadow_logfd and Prog not extern

Closes #444
Closes #465

Signed-off-by: Serge Hallyn <serge@hallyn.com>

src/groupmod.c

@@ -56,6 +56,7 @@
 #ifdef	SHADOWGRP
 #include "sgroupio.h"
 #endif
+#include "shadowlog.h"
 /*
  * exit status values
  */
@@ -76,7 +77,6 @@
  * Global variables
  */
 const char *Prog;
-FILE *shadow_logfd = NULL;
 
 #ifdef	SHADOWGRP
 static bool is_shadow_grp;
@@ -793,7 +793,8 @@ int main (int argc, char **argv)
 	 * Get my name so that I can use it to report errors.
 	 */
 	Prog = Basename (argv[0]);
-	shadow_logfd = stderr;
+	log_set_progname(Prog);
+	log_set_logfd(stderr);
 
 	(void) setlocale (LC_ALL, "");
 	(void) bindtextdomain (PACKAGE, LOCALEDIR);