Workaround for bug #1558983

There is an issue with custom icons on directories in the 2.5c2 installer,
don't set a custom icon on "/Applications/MacPython 2.5" for now.

Also make sure that the installer doesn't crap out when the Makefile in the
system's python installation has other customizations than we expect.
diff --git a/Mac/BuildScript/build-installer.py b/Mac/BuildScript/build-installer.py
index 083209b..3176c7e 100755
--- a/Mac/BuildScript/build-installer.py
+++ b/Mac/BuildScript/build-installer.py
@@ -945,6 +945,10 @@
     ref, isDirectory = Carbon.File.FSPathMakeRef(filePath)
 
     if isDirectory:
+        # There is a problem with getting this into the pax(1) archive,
+        # just ignore directory icons for now.
+        return
+
         tmpPath = os.path.join(filePath, "Icon\r")
         if not os.path.exists(tmpPath):
             fp = open(tmpPath, 'w')