CMake: fix clang-cl build

Add two more warnings to ignore. These show up when including glslang
headers in samples/main.cc.

Change-Id: Icdb9fa9914bfe6fdafb4727ed8bf774fe9b930bf
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/73660
Reviewed-by: James Price <jrprice@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Antonio Maiorano <amaiorano@google.com>

CMakeLists.txt

@@ -374,6 +374,8 @@ function(tint_default_compile_options TARGET)
         -Wno-global-constructors
         -Wno-zero-as-null-pointer-constant
         -Wno-shorten-64-to-32
+        -Wno-shadow-field-in-constructor
+        -Wno-reserved-id-macro
       )
     endif()
   endif()