docs: the Windows build is a cross-compile, and only that

The docs offered a native build as an equal alternative -- "the same
command builds natively on the Windows box itself, with zig on PATH and
a make" -- and it does not work. Makefile.windows needs sed, cat,
mkdir -p and shell grouping, none of which cmd.exe has; and on ARM64
`zig cc` in zig 0.16.0 dies with an access violation on a one-line C
file, so the compiler cannot run there at all. The zip that does it
matches the published shasum, so this is upstream rather than a bad
download.

Nobody following those two sentences reached a binary. So they are
gone, along with the "# host arch, native" usage line in the makefile
and the "cross-compiles too" aside in the two install sections, which
both implied that building on the box was the normal path and the
cross-compile a bonus. It is the other way round, and now the pages
say so once, in the same words each time.

`builds and runs natively` on the doc's first line loses `builds`:
what is native about slosh.exe is the binary, not where it was made.

0 files changed, 0 insertions, 0 deletions