Retrieve generator variables and use those for prefix/suffix, rather than repeating

Retrieve generator variables, rather than repeating.

A bit ugly to retrieve again via CalculateVariables, but seems better than having a second copy where I can break 'em. :/

It looks like other uses of generator_default_variables look like they might be semi-incorrect too, but maybe doesn't matter much.
Committed: https://code.google.com/p/gyp/source/detail?r=1211

[Nico, 2012-02-16 23:40:18]

LGTM

(The prefixes / suffixes are duplicated in gyp/xcode_emulation.py too iirc. But
the mac side is fairly well covered by tests.)

http://chromiumcodereview.appspot.com/9420031/diff/4001/pylib/gyp/generator/n...
File pylib/gyp/generator/ninja_test.py (right):

http://chromiumcodereview.appspot.com/9420031/diff/4001/pylib/gyp/generator/n...
pylib/gyp/generator/ninja_test.py:14: 
FWIW, I think system tests are better to explain _why_ this needs to match. I'd
have a reduced version of the nacl gyp file instead.

[scottmg, 2012-02-16 23:49:01]

On 2012/02/16 23:40:18, Nico wrote:
> FWIW, I think system tests are better to explain _why_ this needs to match.
I'd
> have a reduced version of the nacl gyp file instead.

You're right, that would be better for the nacl_bootstrap_raw wacky link thing.
I was thinking that even if that case worked either way, it's just better to
avoid having the non-normal prefixes or suffixes.