I tested a release build and it saved a total of 10,752 bytes.
On the other hand, it had a rather huge maintenance overhead, since I had
to ensure that all extlibs had __cdecl set up in the headers properly,
and this had to be redone on every update.
The i386 build of LZ4 on AppVeyor was failing in tests because of missing
stdcall symbols. I decided not to bother adding stdcall support to LZ4
and simply revert stdcall entirely.
I somehow missed these when updating zstd earlier. It only seemed to
break the MinGW-w64 builds, which is odd, since I would have expected
this to break every build in cases where we didn't have a system zstd...
It turns out we need it because other modules are compiled with /Gz,
even if zstd isn't.
FIXME: Compiling zstd with /Gz fails due to C2373 type redefinition
errors, which doesn't make any sense...
MiniZip 2.10.0 added support for zstd as a compression method, so we
should support it.
Note that a system version of zstd is preferred on Linux systems.
Enabled the MiniZip test tools for manual builds only. Info-ZIP hasn't
been updated in a while, so I'm going to use the MiniZip test tools to
compress ZIP archives using zstd.
Enabled MiniZip compression in order to compress stuff using the minizip
test program.
mz_strm_zstd.c: FIXME: Compression level doesn't work. Hard-coded the
maximum compression level for now.
