Change ctypedefs, and change some constants to unsigned, to fix MWC64 and simplify compiled C code.
Change ctypedefs, and change some constants to unsigned, to fix MWC64 and simplify compiled C code.

cmcqueen/simplerandom,cmcqueen/simplerandom,cmcqueen/simplerandom,cmcqueen/simplerandom,cmcqueen/simplerandom