Patch for MinGW-W64 port

[B. Scott Michel]

The attached patch enhances support for W64 using the (relatively new) 
MinGW-W64 environment. MinGW-W64 uses the LP64 model, which explains the 
changes that eliminate int-to-pointer and pointer-to-int conversion 
warnings by gcc. The other minor change required is that libopts assumed 
that gettext() came from stdio.h; I would imagine other platforms 
actually have to include libintl.h and have an explicit dependency on 
-lintl during linking.

Hope this benefits more than just the MinGW community.


-scooter
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