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5db836b2a8
Unless I'm missing something, it looks like `libssh2.h` has been using
`libssh2_int64_t` unconditionally since at least 2010-04-17 when
`libssh2_scp_send64()` landed via commit
be9ee7095e.
This makes it redundant to detect `HAVE_LONGLONG` to fallback to a
32-bit `scpRecv_size` in `libssh2_priv.h`. Then deal with possible
combinations of this flag and `strtoll()` options, which was
error-prone.
Instead, assume in `libssh2_priv.h` that we have `libssh2_int64_t`, and
use it always.
For MSVC, this means `_MSC_VER` `1310` (from year 2003) is now
required. Based on the above, this was already so before this patch.
If there happens to be no 64-bit `strtoll()` detected, fall back to the
32-bit `strtol()` (this should never happen with MSVC, and probably
neither with any other reasonably modern toolchain.)
Also make sure to set `HAVE_STRTOI64` for older, non-CMake, MSVC builds
(e.g. `Makefile.mk` or `NMakefile` ones).
Closes #1002