ninja depscanner: handle C++ sources named capital C

In commit 4ca9a16288f51cce99624a2ef595d879acdc02d8 we added unreliable
support (it warns you if you try it) for gcc-compatible treatment of
uppercase-C files being C++ instead of C. In order to handle it
correctly, we needed to evaluate can-compile by special-casing "C" to
avoid lowercasing it for comparisons.

This didn't cover all cases where we check if "C" is a C++ language
file. We also straight-up check the language of a file (rather than
working backwards to see if a C++ compiler can compile it) when doing
module scanning, and this needs to special-case "C" as well.

We also had one case where we only checked lowercase fortran extensions,
but not lowercase C++ extensions. While we are at it, use lowercase for
C++ as well, except the "C" special case.

Fixes #10629

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