[C++ Patch] Improve check_var_type locations

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

by adding a location_t parameter we can improve the locations of the 
error messages. At the moment the locations of the first and third 
message end up being input_location anyway, but we can imagine improving 
those later (this a much more general issue, the locations we use when 
unnamed entities are involved, see for example all the 'if (name)' in 
grokdeclarator and elsewhere: input_location is very rarely the best 
location).

Testex x86_64-linux.

Thanks, Paolo.

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