check-code: drop the 'format' built-in

I'm not clear what it is doing, but one who knows what it is about can now make
use of it.

contrib/check-code.py

@@ -239,8 +239,6 @@ pypats = [
 #    (r'in range\(', "use xrange"),
 #    (r'^\s*print\s+', "avoid using print in core and extensions"),
     (r'[\x80-\xff]', "non-ASCII character literal"),
-    (r'(?<!def)\s+(format)\(',
-     "format not available in Python 2.4", 'no-py24'),
     (r'if\s.*\selse', "if ... else form not available in Python 2.4"),
     (r'^\s*(%s)\s\s' % '|'.join(keyword.kwlist),
      "gratuitous whitespace after Python keyword"),

tests/test-check-code.t

@@ -18,10 +18,6 @@
   > a, '\\\\\\\\', "\\\\\\" x-2", "c-1"
   > EOF
   $ cat > non-py24.py <<EOF
-  > # Using builtins that does not exist in Python 2.4
-  > if True:
-  >     y = format(x)
-  > 
   > # try/except/finally block does not exist in Python 2.4
   >     try:
   >         pass
@@ -68,9 +64,6 @@
   ./quote.py:5:
    > '"""', 42+1, """and
    missing whitespace in expression
-  ./non-py24.py:3:
-   >     y = format(x)
-   format not available in Python 2.4
   ./classstyle.py:4:
    > class oldstyle_class:
    old-style class, use class foo(object)