Remove C compiler requirement from install docs
Remove C compiler requirement from install docs

Summary:Buck used to require a C compiler to build the nailgun client, but
today it uses a Python implementation instead. Remove the C
compiler requirement from the documentation.

Test Plan:Run `./docs/soyweb-local.sh`, check
`http://localhost:9811/setup/install.html`.

Reviewed By: Coneko

fb-gh-sync-id: cfc5377
shipit-source-id: cfc5377

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