[UBSan][quickjs] Temporarily disable UBSan

UBSan was complaining about indexing out of bounds of an array.
Disable UBSan for this target for now, then we will come back to fix it
once asan-ubsan is migrated into CQ.

Bug: 47041
Change-Id: I4ca7f5d944f5179bbe1d95ceb2918a7a803160c0
diff --git a/BUILD.gn b/BUILD.gn
index 534a3f0..e560891 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -39,6 +39,10 @@
     deps = [
       "//zircon/public/lib/fdio",
     ]
+
+    # TODO(47041): UBSan has found an instance of undefined behavior in this target.
+    # Disable UBSan for this target temporarily until it is migrated into CI/CQ.
+    configs += [ "//build/config:temporarily_disable_ubsan_do_not_use" ]
   }
   public_configs = [ ":qjs-config" ]
 }