util: move "default" makedir to posix.py
makedir is already defined in win32.py, which gets imported into util.py
via windows.py if we are running on Windows
test that 'hg commit' does not crash if the user removes a newly added file
$ hg init
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ touch b
$ hg add b
$ rm b
$ hg commit -A -m"comment #1"
removing b
nothing changed
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