Fix build breaks in ncurses c++ binding

[Adam Jiang]

This patch fixes building breaks in c++ directory.

The first issue fixed by this patch is about constructors which are declared 
with Form** type by passed Form* type. Second one is about the method which 
convert template parameter T* to void*. It should not work with ‘const_cast’. 
The patch changed them into a combination with ‘const_cast’ and 
‘reinterpret_cast’ that do actually convert types.

0001-Fix-build-breaks-in-C-code.patch
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