ninja windows: fix program path normalization

ninja windows: fix program path normalization

Fixes currently broken ninja buildbot tests.

R=thakis@chromium.org

Committed: https://code.google.com/p/gyp/source/detail?r=1356

[Nico, 2012-05-02 21:52:47]

lgtm

[scottmg, 2012-05-03 21:12:51]

On 2012/05/02 21:42:03, scottmg wrote:

Bah. IDK what the logic here is, but it's not the loving path correction I was
looking for.

gyp tests don't often have ../ in them because the .gyp is at the root, rather
than below the root as it is in Chromium. Fix to the fix (to the fix?)
forthcoming.

>>> import os
>>> os.path.normpath('call a')
'call a'
>>> os.path.normpath('call a/b/c.bat')
'call a\\b\\c.bat'
>>> os.path.normpath('call ../../a.bat')
'a.bat'
>>> os.path.normpath('call ../../b/c/d/a.bat')
'b\\c\\d\\a.bat'
>>> os.path.normpath('call ../b/c/d/a.bat')
'call ..\\b\\c\\d\\a.bat'

[scottmg, 2012-05-03 21:24:03]

On 2012/05/03 21:12:51, scottmg wrote:

Even better, 'call' can disappear:

>>> os.path.normpath('call ../../../go.bat')
'..\\go.bat'

Garbage In, Garbage Out, I guess.