Missing "free" reference

[beoboo]

Using a brand new MAC OS environment, there is a compilation error:

/works/cpp/fruit/src/demangle_type_name.cpp:32:5: error: use of undeclared identifier 'free'
free(demangled_name);

that can be fixed by adding:

#include <cstdlib> 

in the same file.

[poletti-marco]

Thanks for the report!
FIxed in 4250ef6
Let me know if there are any further issues on OS X, I don't have a Mac so can't test myself, but happy to fix any issues you might find.