The NDS and AmigaOS ports have frequent buildbot issues, because they
need to use 'long' for int32, for their own reasons. The buildbot is
run *after* things are merged into the main branch, so we'd like to
catch the frequent int/int32 build issues as an earlier development
stage (such as by the automated Github Actions).
MSVC 32-bit builds look like a good candidate for this, since its
'long' is also a 32-bit value on Win32, this platform is tested by
Github Actions right from the PR stage, and there are more developers
doing frequent local build tests there.
Not applying this change to Mingw builds yet, since GCC is less
permissive about this trick (i.e. -Wformat becomes quite noisy), and
the Mingw builds are used for releases, so let's be safe for now.
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