Rust: Enable MSVC build

Author: angelsl

lib/builtins/CMakeLists.txt

@@ -347,7 +347,7 @@ if (APPLE)
   add_subdirectory(Darwin-excludes)
   add_subdirectory(macho_embedded)
   darwin_add_builtin_libraries(${BUILTIN_SUPPORTED_OS})
-elseif (NOT WIN32 OR MINGW)
+else ()
   foreach (arch ${BUILTIN_SUPPORTED_ARCH})
     if (CAN_TARGET_${arch})
       # Filter out generic versions of routines that are re-implemented in