Fix macos and windows builds, keep the tools out of the game build

macos: libultraship declares spdlog with OVERRIDE_FIND_PACKAGE so its own
find_package(spdlog REQUIRED) resolves, but torch declares spdlog without
it, and FetchContent_Declare is first-wins. Configuring torch first made
LUS's declaration a no-op and left find_package with no config to find.
It only showed on macos because that's the platform where neither project
finds an installed spdlog -- it's kept out of macports.yml because its fmt
dependency breaks the universal build -- so both fall through to fetching.
Declaring it ahead of both keeps macos on the same source-built v1.16.0 it
used before. Torch already uses OVERRIDE_FIND_PACKAGE for tinyxml2 and
zlib, so the real fix is upstream.

windows: soh builds with /WX, and TorchExtract.cpp is the one translation
unit reaching yaml-cpp through torch's headers, which trips the
dll-interface warnings. Suppress those two on that file.

EXCLUDE_FROM_ALL on soh-torch and soh-o2r-packer: they are build-time
tools, so building the game shouldn't compile them. ExtractAssets and
GenerateSohOtr still pull them in through DEPENDS.

Drops the .gitattributes rule for the prebuilt archive, which is gone.

.gitattributes

@@ -1,6 +1 @@
 * text=auto eol=lf
-
-# TEMPORARY (Torch migration): checked-in archive. text=auto would almost certainly
-# detect this as binary anyway, but an eol conversion on a 4.4 MB zip would corrupt it
-# silently, so say so explicitly. Remove with prebuilt/ -- see prebuilt/README.md.
-prebuilt/soh.o2r binary