`lexer.cpp.track.preprocessor` lexer properties affects which styles
are used, and we don't set those, so no filetype inheriting C styles
should set it to 1.

Similarly, some properties like `styling.within.preprocessor` are
mostly general settings rather than selecting syntax details, so they
should probably match in all filetypes for consistency.

So, inherit the C lexer_properties everywhere C styles are used, and
only override specific properties in the inheriting filetype.