Remove virtual and add override to all virtual functions in Process/gdb-remote.

llvm-svn: 232952
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
index f8b3bdd..0a0f0e4 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
@@ -77,7 +77,7 @@
                                           StringExtractorGDBRemote &response);
 
     bool
-    GetThreadSuffixSupported ();
+    GetThreadSuffixSupported () override;
 
     // This packet is usually sent first and the boolean return value
     // indicates if the packet was send and any response was received