skip issues of file "C"

[tgulacsi]

Solves

WARN[0005] running error: can\'t print 99 issues: can\'t read file C for printing issued line: open C: no such file or directory

errors of checking projects using cgo.

You can check it on gopkg.in/goracle.v2

[jirfag]

thank you for the contribution!
But this fix should be done in a next way:

1. checking filename in nolint processor: now it's in text printer, but there are also json and tab printers.
2. adding a test for this case similar to existing tests for nolint processor

[jirfag]

needs changes

[jirfag]

fixed in #70