v2.16m

• Add defines for needed integer types and macros from inttypes.h missing in older MSVC versions. MSVC 2010 and later appear to have enough C99 support.
• Add define tests for _WIN32 and _WIN64 to cover all WINs.
• ms_fread(): Add cast to quiet warning for conversion from size_t to int. In this case the read will always be <= MAXRECLEN, much smaller than int, making the conversion safe.