[lldb] (Temporarily) disable vfork-follow-parent-wp.test on Darwin

The test is failing on GreenDragon. Pinged MichaƂ in D98822.

GitOrigin-RevId: e761b6b4c58d4f7ae1073d925d7cb321d68ee93a
diff --git a/test/Shell/Subprocess/vfork-follow-parent-wp.test b/test/Shell/Subprocess/vfork-follow-parent-wp.test
index d73b854..8c74e28 100644
--- a/test/Shell/Subprocess/vfork-follow-parent-wp.test
+++ b/test/Shell/Subprocess/vfork-follow-parent-wp.test
@@ -1,5 +1,6 @@
 # REQUIRES: native && dbregs-set
 # UNSUPPORTED: system-windows
+# UNSUPPORTED: system-darwin
 # RUN: %clangxx_host -g %p/Inputs/fork.cpp -DTEST_FORK=vfork -o %t
 # RUN: %lldb -b -s %s %t | FileCheck %s
 process launch -s