message: Relax testcase.
  Recent versions of llvm monorepo builds build libc++abi.dylib as libc++abi.1.dylib.
  This accespts both variants.
diff: @@ -1703,7 +1703,7 @@ class Base(unittest2.TestCase):
  if self.getPlatform() in ('freebsd', 'linux', 'netbsd', 'openbsd'):
  return ['libc++.so.1']
  else:
  - return ['libc++.1.dylib', 'libc++abi.dylib']
  + return ['libc++.1.dylib', 'libc++abi.']
  # Metaclass for TestBase to change the list of test metods when a new TestCase is loaded.
  # We change the test methods to create a new test method for each test for each debug info we are
  