mozcommitbuilder tries to build multicore on Windows with custom .mozconfig

[Frankst2]

When providing a custom .mozconfig on Windows, mozcommitbuilder tries to build with multicore anyway and the build will fail. I use the latest mozillabuild version and build inside the Mingw32 console window.
Example:
mozcommitbuilder --good=2012-05-31 --bad=2012-06-01 -m mozconfig-bisect
[...]
Adding client.mk options from c:/Users/Frank\moz-commitbuilder-cache\mozconf\con
fig-default:
MOZ_OBJDIR=$(TOPSRCDIR)/obj-ff-dbg
MOZ_MAKE_FLAGS=-s -j 4
[...]
/c/Users/Frank/moz-commitbuilder-cache/mozbuild-trunk/browser/build.mk:36: *** Y
ou are using GNU make to build Firefox with -jN on Windows. This will randomly d
eadlock. To compile a parallel build on Windows run "python -OO build/pymake/mak
e.py -f client.mk build". See https://developer.mozilla.org/en/pymake for more d
etails.. Stop.

[Frankst2]

Suggested fix for this issue: In this code line https://github.com/mozilla/mozcommitbuilder/blob/master/mozcommitbuilder/builder.py#L217 change
if sys.platform != "win32" or sys.platform != "cygwin":
to
if sys.platform != "win32" and sys.platform != "cygwin":