Don't automtically try to import pexpect in lldbpexpect.

Since pexpect doesn't exist on Windows, tests which are xfail'ed
are not being run at all because they are failing when the file
is imported due to the `import pexpect`.  This puts the import
behind a conditional and makes an empty base class in the case
where pexpect is not present.

llvm-svn: 258965

lldb/packages/Python/lldbsuite/test/lldbpexpect.py

@@ -6,13 +6,19 @@ import os
 import sys
 
 # Third-party modules
-import pexpect
+import six
 
 # LLDB Modules
 import lldb
 from .lldbtest import *
 from . import lldbutil
 
+if sys.platform.startswith('win32'):
+    class PExpectTest(TestBase):
+        pass
+else:
+    import pexpect
+
     class PExpectTest(TestBase):
     
         mydir = TestBase.compute_mydir(__file__)