Don't support spaces in command, simplify msvs_emulation

Don't support spaces in command, simplify msvs_emulation

The batch-file-with-space test doesn't work for the msvs generators.

I looked at trying to fix it, but it got overly complicated because the VS
generators don't distinguish between the program and arguments to the program.
In general, I don't think gyp really supports spaces in filenames so it
doesn't seem worth spending the effort going down that path.

So, test that it doesn't work for all generators, and simplify msvs_emulation for ninja.

R=thakis@chromium.org

Committed: https://code.google.com/p/gyp/source/detail?r=1353

[Nico, 2012-05-02 17:59:46]

Removing the third target sounds better to me. If MSVC doesn't get this right,
winja doesn't have to get it right either (probably preferable even), if that
allows you to simplify msvs_emulation. (in that case, you could leave the third
target and test that it doesn't compile)

[scottmg, 2012-05-02 19:15:28]

Amended to have third test explicitly fail, and remove special cases from
msvs_emulation.

[Nico, 2012-05-02 20:53:48]

lgtm