Add sys call MSC_iokit_user_client_trap to the WebContent process' sa…

…ndbox

https://bugs.webkit.org/show_bug.cgi?id=240685
<rdar://93600722>

Reviewed by Chris Dumez.

* Source/WebKit/WebProcess/com.apple.WebProcess.sb.in:

Canonical link: https://commits.webkit.org/250768@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@294511 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebKit/WebProcess/com.apple.WebProcess.sb.in

@@ -2200,6 +2200,7 @@
         MSC__kernelrpc_mach_vm_purgable_control_trap
         MSC_host_create_mach_voucher_trap
         MSC_host_self_trap
+        MSC_iokit_user_client_trap
         MSC_mach_generate_activity_id
         MSC_mach_msg_trap
         MSC_mach_reply_port