Link Windows system libraries for Rust FFI

The Rust standard library depends on ws2_32 (Windows Sockets),
ntdll (NT API), userenv, and bcrypt system libraries. Add these
as INTERFACE_LINK_LIBRARIES on Windows so consumers of the
spirv-tools-ffi imported target get them linked automatically.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: LegNeato

CMakeLists.txt

@@ -180,6 +180,12 @@ if(SPIRV_ENABLE_RUST_TARGET_ENV)
   add_library(spirv-tools-ffi STATIC IMPORTED GLOBAL)
   add_dependencies(spirv-tools-ffi spirv-tools-ffi-rust)
   set_target_properties(spirv-tools-ffi PROPERTIES IMPORTED_LOCATION ${SPIRV_RUST_LIB_PATH})
+
+  # On Windows, the Rust standard library requires these system libraries
+  if(WIN32)
+    set_target_properties(spirv-tools-ffi PROPERTIES
+      INTERFACE_LINK_LIBRARIES "ws2_32;ntdll;userenv;bcrypt")
+  endif()
 endif()
 
 option(SPIRV_COLOR_TERMINAL "Enable color terminal output" ON)