FreeBSD Port: firefox-63.0.1,1 multiple errors build

[Christoph Moench-Tegeder]

## Alex V. Petrov (alexvpetrov at gmail.com):

> Compiling style v0.0.1
> (/usr/ports/www/firefox/work/firefox-63.0.1/servo/components/style)
> error: failed to run custom build command for `style v0.0.1

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229893#c20 ff.

Regards,
Christoph

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