Don't import lock on Windows.

lock imports fcntl, which doesn't exist on Windows.  If we need
to use this class on Windows, we will need to implement something
based on the CreateMutex API.

llvm-svn: 237292

lldb/test/dotest.py

@@ -23,7 +23,6 @@ for available options.
 import commands
 import os
 import errno
-import lock
 import platform
 import progress
 import signal
@@ -439,6 +438,7 @@ def setupCrashInfoHook():
     global setCrashInfoHook
     setCrashInfoHook = setCrashInfoHook_NonMac # safe default
     if platform.system() == "Darwin":
+        import lock
         test_dir = os.environ['LLDB_TEST']
         if not test_dir or not os.path.exists(test_dir):
             return