[PATCH] implement a -Wformat-pedantic warning

[Seth Cantrell]

This enables a warning corresponding to gcc's warning of using %p modifiers with non-void* pointers, and to the printf/scanf specs which require void*.

The warning is on by default for -Weverything users, off by default for others. It can be enabled with -pedantic or -Wformat-pedantic. It's not enabled by -Wformat.

The patch includes tests and the clang-test target passes with this patch applied to a recent clang revision.

I used clang-format to format my changes and the patch includes cleanup of a few trailing whitespace issues that were near my changes.

See also the email thread at: http://lists.cs.uiuc.edu/pipermail/cfe-dev/2015-February/041714.html

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