lldb: move away from local sockets to stdio coms

can now pluginto any host via ssh.
define QTC_LLDB_GUEST=/some/script in the env
where script is a wrapper that does ssh, or whatever you need

src/plugins/debugger/debuggerrunner.cpp

@@ -460,6 +460,8 @@ static DebuggerEngineType engineForToolChain(int toolChainType)
         case ProjectExplorer::ToolChain_RVCT_ARMV5_GNUPOC:
         case ProjectExplorer::ToolChain_GCCE_GNUPOC:
         case ProjectExplorer::ToolChain_GCC_MAEMO:
+            if (getenv("QTC_LLDB_GUEST"))
+                return LldbEngineType;
 #ifdef WITH_LLDB
             // lldb override
             if (Core::ICore::instance()->settings()->value("LLDB/enabled").toBool())