Revert "[JITLink] Add missing symbols for ELF ehframe testcase, re-enable ...."

This reverts commit 6e585396.

This failed in http://lab.llvm.org:8011/#/builders/123/builds/2676. I guess
were're still missing some symbols, but unfortunately the specific error is
masked by a bug in python/lit that hides stderr. This test will have to remain
disabled on Windows until I can get help to debug it further.