fixing ID: 2833831 "mapilib/Mapi.h missing HAVE_LONG_LONG" https://sourceforge.net/tracker/?func=detail&aid=2833831&group_id=56967&atid=482468
fixing
ID: 2833831 "mapilib/Mapi.h missing HAVE_LONG_LONG"
https://sourceforge.net/tracker/?func=detail&aid=2833831&group_id=56967&atid=482468

to define types mapi_int64 & mapi_uint64,
we no longer depend on HAVE_LONG_LONG and HAVE___INT64
as defined by our configure in our *_config.h,
but rather assume that
- Microsoft & Intel compilers under Windows have type __int64
- gcc and other (Unix-) compilers (usually) have type long long

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