scan-build/ccc-analyzer @file support

[Alex Coffin via cfe-commits]

The attached patch adds support for @files to ccc-analyzer (which is used
by scan-build). This feature is a commonly accepted compiler option that
clang, gcc, and cl.exe (microsoft's compiler) all already support. This
will allow scan-build to support it too (assuming that the perl version of
ccc-analyzer is used).

Sincerely,
Alexander Coffin
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