[PythonCE] Another (extremely minor) fix to 2.3.4

[David L. Kashtan]

The test_import regression test writes a file which is then
compiled and imported.  The path is just "longlist", which is
a relative path and places it in "\Temp" on the Pocket PC.
The test then appends "" (an empty string) to sys.path and
does the import.  Unfortunately, there is a code path in import
that attempts to do some case checking that does not convert the
filename to an absolute path.  This caused the test to fail.

This is now fixed.  I don't expect it to affect many people.

David Kashtan
Validus Medical Systems