Change TestAbbreviations test to expected failure on Linux.

See http://llvm.org/bugs/show_bug.cgi?id=18816.
Likely the same issue as http://llvm.org/bugs/show_bug.cgi?id=18805.

llvm-svn: 201244

lldb/test/functionalities/abbreviation/TestAbbreviations.py

@@ -13,6 +13,7 @@ class AbbreviationsTestCase(TestBase):
     mydir = TestBase.compute_mydir(__file__)
 
     @expectedFailureFreeBSD('llvm.org/pr18805')
+    @expectedFailureLinux('llvm.org/pr18816')
     def test_nonrunning_command_abbreviations (self):
         self.expect("ap script",
                     startstr = "The following built-in commands may relate to 'script':",