Debugger: failing to retrieve the query filename on non-WIN32 platforms

[Gabriel Petrovay]

In the DebuggerServer, the query file name is needed to be sent to the debugger clients in the DBGP protocol.

But this call fails under on Unix based systems:
aQuery->getFileName()

Therefore there is this comment in the code:

  // TODO: under Linux, when trying to get the file name of the query
  // the call fails because getFileName tries to get a lock that
  // is already taken. Therefore the assertion in mutex.cpp:63
  // terminates the execution