Make shadow_logfd and Prog not extern

Closes #444
Closes #465

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

src/groups.c

@@ -39,11 +39,11 @@
 #include <stdio.h>
 #include "defines.h"
 #include "prototypes.h"
+#include "shadowlog.h"
 /*
  * Global variables
  */
 const char *Prog;
-FILE *shadow_logfd = NULL;
 
 /* local function prototypes */
 static void print_groups (const char *member);
@@ -127,7 +127,8 @@ int main (int argc, char **argv)
 	 * Get the program name so that error messages can use it.
 	 */
 	Prog = Basename (argv[0]);
-	shadow_logfd = stderr;
+	log_set_progname(Prog);
+	log_set_logfd(stderr);
 
 	if (argc == 1) {