Fix bipmkpw compilation issues per external variables

- Add missing extern stanza to global variables

Signed-off-by: Loïc Gomez <bip@animanova.fr>

src/bipmkpw.c

@@ -23,9 +23,9 @@
 #include "util.h"
 #include "md5.h"
 
-int conf_log_level;
-FILE *conf_global_log_file;
-int conf_log_system;
+extern int conf_log_level;
+extern FILE *conf_global_log_file;
+extern int conf_log_system;
 
 void bipmkpw_fatal(char *msg, char *err)
 {