Fix CMake build with MSVC

Bug: None

Change-Id: I061984e649f89e92e2769fd8aba141bbfdc0d4bb
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/28144
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
diff --git a/third_party/CMakeLists.txt b/third_party/CMakeLists.txt
index f0bb8ab..b228539 100644
--- a/third_party/CMakeLists.txt
+++ b/third_party/CMakeLists.txt
@@ -46,7 +46,7 @@
     # Change the default value of SHADERC_ENABLE_SHARED_CRT to ON as that's what matches the
     # CMake defaults better.
     if(MSVC)
-        option(SHADERC_ENABLE_SHARED_CRT "Use the shared CRT instead of the static CRT" ON CACHE BOOL "" FORCE)
+        set(SHADERC_ENABLE_SHARED_CRT ON CACHE BOOL "Use the shared CRT instead of the static CRT")
     endif()
 
     message(STATUS "Dawn: using shaderc at ${DAWN_SHADERC_DIR}")