Make z_size_t 64 bits when compiling on Windows with Z_SOLO.

Z_SOLO defines z_size_t as an unsigned long. However Windows and
MinGW-w64 are LLP64, where a long is 32 bits, but a size_t is 64
bits. This makes z_size_t, used by adler32_z() and crc32_z(), 64
bits on those systems.
3 files changed