git-p4.py: support Python 2.5

Python 2.5 and older do not accept None as the first argument to
translate() and complain with:

   TypeError: expected a character buffer object

As suggested by Pete Wyckoff, let's just replace the call to translate()
with a regex search which should be more clear and more portable.

This allows git-p4 to be used with Python 2.5.

Signed-off-by: Brandon Casey <bcasey@nvidia.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

INSTALL

@@ -131,7 +131,7 @@ Issues of note:
 	  use English. Under autoconf the configure script will do this
 	  automatically if it can't find libintl on the system.
 
-	- Python version 2.6 or later is needed to use the git-p4
+	- Python version 2.5 or later is needed to use the git-p4
 	  interface to Perforce.
 
  - Some platform specific issues are dealt with Makefile rules,

git-p4.py

@@ -742,7 +742,8 @@ def wildcard_encode(path):
     return path
 
 def wildcard_present(path):
-    return path.translate(None, "*#@%") != path
+    m = re.search("[*#@%]", path)
+    return m is not None
 
 class Command:
     def __init__(self):