Patch from Nick Fedchik to fixup paths in busybox/libpwdgrp

which were not properly using the bb_path_*_file strings.

libpwdgrp/getpwuid.c

@@ -30,7 +30,7 @@ struct passwd *getpwuid(uid_t uid)
 	int passwd_fd;
 	struct passwd *passwd;
 
-	if ((passwd_fd = open("/etc/passwd", O_RDONLY)) < 0)
+	if ((passwd_fd = open(bb_path_passwd_file, O_RDONLY)) < 0)
 		return NULL;
 
 	while ((passwd = __getpwent(passwd_fd)) != NULL)