Update win32mbcs extension
* Code cleanup by Matt.
* Fix the issue with case-insensitive fs support
by wrapping also util.fspath() and util.checkcase()
* Abort program when path conversion is failed.
#!/bin/sh
# a test for issue586
hg init a
cd a
echo a > a
hg ci -Ama
hg init ../b
cd ../b
echo b > b
hg ci -Amb
hg pull -f ../a
hg merge
hg rm -f a
hg ci -Amc
hg st -A