When cet is disabled, propagate to v8_shell

Before: when cet is disabled v8_shell is marked with the
cetcompat bit, which breaks the chromium build on cet
machines.

With this CL: v8_shell is not marked as cetcompat unless
v8_enable_cet_shadow_stacks is true.

Bug: chromium:1289318
Change-Id: If8a79ac5288a9a3385bf6b692db566508cca248f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3656146
Commit-Queue: Alex Gough <ajgo@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80673}

BUILD.gn

@@ -6399,6 +6399,10 @@ if (want_v8_shell) {
       ":internal_config_base",
     ]
 
+    if (is_win && !v8_enable_cet_shadow_stack) {
+      v8_remove_configs += [ "//build/config/compiler:cet_shadow_stack" ]
+    }
+
     deps = [
       ":v8",
       ":v8_libbase",