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ninja depscanner: handle C++ sources named capital C
In commit 4ca9a16 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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