Fix Linux build after r196787

Patch from Xavier de Gaye

llvm-svn: 196830
diff --git a/lldb/source/Plugins/Process/Linux/LinuxThread.h b/lldb/source/Plugins/Process/Linux/LinuxThread.h
index d12c0c9..f20b589 100644
--- a/lldb/source/Plugins/Process/Linux/LinuxThread.h
+++ b/lldb/source/Plugins/Process/Linux/LinuxThread.h
@@ -33,7 +33,7 @@
 
     // POSIXThread overrides
     virtual bool
-    LinuxThread::Resume();
+    Resume();
 
     virtual void
     RefreshStateAfterStop();