ignore alt_tokens when checking fncall spacing

[bkietz]

When readability/alt_tokens is disabled they can be parsed as a function name:

1 and (1 + 1)
     ^ spurious 'Extra space before ( in function call'

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[bkietz]

@googlebot I signed it!

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[tkruse]

Also consider contributing to the fork at https://github.com/cpplint/cpplint

[bkietz]

@tkruse I thought protocol was to get accepted here first?

[tkruse]

@bkietz: You are right in that this is upstream, and https://github.com/cpplint/cpplint is an unofficial fork, so the ideal process would be to merge here first and make the fork follow. However many good PRs here are never merged as evident in the PR history, whereas in the fork there is a little more flexibility to merge small changes.

Also I meant in a general sense, you could help maintaining the fork, if you like supporting cpplint.