[sail] Disable self copying dependencies.

[Billy O'Neal (BillyONeal)]

I'm getting errors like this as part of the Visual Studio 2026 19.6.0 / MSVC 19.51 update:

-- Performing post-build validation
D:\vcpkg\ports\sail\portfile.cmake: warning: DLLs should not be present in a static build, but the following DLLs were found. To suppress this message, add set(VCPKG_POLICY_DLLS_IN_STATIC_LIBRARY enabled)
D:\vcpkg\packages\sail_x64-windows: note: the DLLs are relative to ${CURRENT_PACKAGES_DIR} here
note: debug/bin/gif.dll
note: debug/bin/jpeg62.dll
note: debug/bin/libpng16d.dll
note: debug/bin/libsharpyuv.dll
note: debug/bin/libwebp.dll
note: debug/bin/libwebpdecoder.dll
note: debug/bin/libwebpdemux.dll
note: debug/bin/libwebpmux.dll
note: debug/bin/turbojpeg.dll
note: debug/bin/zd.dll
note: bin/gif.dll
note: bin/jpeg62.dll
note: bin/libpng16.dll
note: bin/libsharpyuv.dll
note: bin/libwebp.dll
note: bin/libwebpdecoder.dll
note: bin/libwebpdemux.dll
note: bin/libwebpmux.dll
note: bin/turbojpeg.dll
note: bin/z.dll
D:\vcpkg\ports\sail\portfile.cmake: warning: ${CURRENT_PACKAGES_DIR}/debug/bin exists but should not in a static build. To suppress this message, add set(VCPKG_POLICY_DLLS_IN_STATIC_LIBRARY enabled)
D:\vcpkg\ports\sail\portfile.cmake: warning: ${CURRENT_PACKAGES_DIR}/bin exists but should not in a static build. To suppress this message, add set(VCPKG_POLICY_DLLS_IN_STATIC_LIBRARY enabled)
note: if creation of these directories cannot be disabled, you can add the following in portfile.cmake to remove them
if(VCPKG_LIBRARY_LINKAGE STREQUAL "static")
  file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug/bin" "${CURRENT_PACKAGES_DIR}/bin")
endif()
D:\vcpkg\ports\sail\portfile.cmake: warning: Found 3 post-build check problem(s). These are usually caused by bugs in portfile.cmake or the upstream build system. Please correct these before submitting this port to the curated registry.
error: The following files are already installed in D:/vcpkg/installed/x64-windows and are in conflict with sail:x64-windows
Installed by giflib:x64-windows:
  bin/gif.dll
  bin/gif.pdb
  debug/bin/gif.dll
  debug/bin/gif.pdb
Installed by libjpeg-turbo:x64-windows:
  bin/jpeg62.dll
  bin/jpeg62.pdb
  bin/turbojpeg.dll
  bin/turbojpeg.pdb
  debug/bin/jpeg62.dll
  debug/bin/jpeg62.pdb
  debug/bin/turbojpeg.dll
  debug/bin/turbojpeg.pdb
Installed by libpng:x64-windows:
  bin/libpng16.dll
  bin/libpng16.pdb
  debug/bin/libpng16d.dll
  debug/bin/libpng16d.pdb
Installed by libwebp:x64-windows:
  bin/libsharpyuv.dll
  bin/libsharpyuv.pdb
  bin/libwebp.dll
  bin/libwebp.pdb
  bin/libwebpdecoder.dll
  bin/libwebpdecoder.pdb
  bin/libwebpdemux.dll
  bin/libwebpdemux.pdb
  bin/libwebpmux.dll
  bin/libwebpmux.pdb
  debug/bin/libsharpyuv.dll
  debug/bin/libsharpyuv.pdb
  debug/bin/libwebp.dll
  debug/bin/libwebp.pdb
  debug/bin/libwebpdecoder.dll
  debug/bin/libwebpdecoder.pdb
  debug/bin/libwebpdemux.dll
  debug/bin/libwebpdemux.pdb
  debug/bin/libwebpmux.dll
  debug/bin/libwebpmux.pdb
Installed by zlib:x64-windows:
  bin/z.dll
  bin/z.pdb
  debug/bin/zd.dll
  debug/bin/zd.pdb
Starting submission of sail[core,gif,highest-priority-codecs,jpeg,png,svg,webp]:x64-windows@0.9.10 to 1 binary cache(s) in the background

Looking at what upstream is doing I have no idea how this is working today.

[Billy O'Neal (BillyONeal)]

/cc Dzmitry Baryshau (@HappySeaFox)