Fix warnings trivial warnings.

Fix warnings about:
 . Unused variables
 . format mismatch in printf/scanf format string and arguments
 . Missing parenthesis around assignment as truth values
 . Clang warnings anout unknown GCC pragma

commands/uue/uue.c

@@ -103,7 +103,7 @@ char *argv[];
   if (lenofname > FILE_NAME) ofname[FILE_NAME] = '\0';
   strcat(ofname, ".uue");
   lenofname = strlen(ofname);
-  if (!split && (filter || (argc > 2) && (argv[2][0] == '-'))) {
+  if (!split && (filter || ((argc > 2) && (argv[2][0] == '-')))) {
 	stdo = 1;
 	outp = stdout;
   } else {