Debugger: Force GNU/Linux osabi when debugging elf on Windows

Coredump fails to open with multi-target gdb on Windows.

Change-Id: I66cea184a84539c9f56cc46d7eabadd7760ba649
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/gdb/coregdbadapter.cpp

@@ -204,6 +204,7 @@ void GdbCoreEngine::writeCoreChunk()
 void GdbCoreEngine::setupInferior()
 {
     CHECK_STATE(InferiorSetupRequested);
+    setLinuxOsAbi();
     // Do that first, otherwise no symbols are loaded.
     QFileInfo fi(m_executable);
     QByteArray path = fi.absoluteFilePath().toLocal8Bit();