[C++ PATCH] Feature macros are long

[Nathan Sidwell]

As discussed on IRC, this adds an L suffix to C++ feature macros, as 
specified by the std.  I'd forgotten that in preprocessor-land, 
expressions are evaluated as longs anyway, but the user might be trying 
to printf these constants, or similar, where the type suffix is significant.

Jakub, Thomas:
     cpp_define (pfile, "_OPENACC=201306");
     cpp_define (pfile, "_OPENMP=201511");
those two macros might need suffixing too, but I don't have a std handy.

nathan
-- 
Nathan Sidwell
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