https://bugs.webkit.org/show_bug.cgi?id=91667

Patch by Scott Graham <scottmg@chromium.org> on 2012-07-24
Reviewed by Tony Chang.

Using native tools instead of cygwin version improves build time
performance by roughly 50% (on top of previous cl-instead-of-gcc
change).

Also, use - instead of / for cl flags, otherwise preprocessing fails
very slowly (due to retry loop). And, replace \ with / in gperf
command line. Without this, gperf emits the filename literally in
#line directives which causes VS to error with "unescaped \ in
string". Bizarrely, building ColorData.cpp with those \ in place
causes the IDE to exit with no error message, which was the cause of
the previous canary failures.

No new tests.

* WebCore.gyp/WebCore.gyp:
* WebCore.gyp/scripts/rule_bison.py:
* bindings/scripts/preprocessor.pm:
(applyPreprocessor):
* make-hash-tools.pl:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@123496 268f45cc-cd09-0410-ab3c-d52691b4dbfc