fix: disable OpenSSL in libtorrent build

Root cause: Qt (network module) and libtorrent both were statically linking
OpenSSL, causing duplicate symbols. The function pointer table in one copy
got corrupted by /FORCE:MULTIPLE, causing infinite recursion in
tls_parse_all_extensions.

Strategy: Disable OpenSSL in libtorrent entirely (-Dopenssl=OFF). libtorrent
will use Boost.Asio's native TLS support (SChannel on Windows) instead. This
eliminates the duplicate symbol problem entirely - only Qt's OpenSSL will be
in the binary, and it will use schannel so there's no circular dependency.

Author: vectorrilke

.github/workflows/ci_windows_arm64_native.yaml

@@ -161,6 +161,7 @@ jobs:
             -Dmmap-disk-io=OFF `
             -Ddeprecated-functions=ON `
             -Dstatic_runtime=ON `
+            -Dopenssl=OFF `
             -DVCPKG_TARGET_TRIPLET=${{ env.vcpkg_triplet }}
 
           cmake --build build