[lldb/test] Skip the AssertFrameRecognizer test for Linux

This patch skips the AssertFrameRecognizer test for Linux since it appears to
fail on certain distributions (AFAIK Fedora & ArchLinux).

The failure happen because the thread don't set the current frame to
the most relevant one. So the stopped location doesn't match with what
the test is expecting.

The test will be enabled again after I'll be able to reproduce the failure
on one of those platform and fix the issue.

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>