Compile JSC on Windows and Linux as well

[mathiasbynens]

CC @dschuff @jfbastien

Ref. v8/web-tooling-benchmark#29 (comment)

[sbc100]

Won't you need to remove the no_windows and no_linux args from line 1430?

Also, you'll need to make the use of xcrun conditional won't you? (since it doesn't exist on non-mac). Maybe xcrun isn't needed? Its not used for other cmake runs in this file.

[dschuff]

I'll give this a try locally.

[mathiasbynens]

Won't you need to remove the no_windows and no_linux args from line 1430?

Yes! Done.

I don’t feel qualified to deal with the xcrun issue, to be honest. Feel free to amend this patch.

[dschuff]

Closing this as obsolete, and because we are moving the code (see #698). If there is an issue with the build scripts, please file an issue against EMSDK