Utils: Remove qPidToPid() adapter function

Since Qt 5.3, there's a QProcess::processId() providing direct access.

Change-Id: Ia9c143c7a92ec61d1aa36ff3f4670ba72a509634
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/plugins/debugger/cdb/cdbengine.cpp

@@ -640,7 +640,7 @@ bool CdbEngine::launchCDB(const DebuggerRunParameters &sp, QString *errorMessage
         return false;
     }
 
-    const unsigned long pid = Utils::qPidToPid(m_process.pid());
+    const qint64 pid = m_process.processId();
     showMessage(QString::fromLatin1("%1 running as %2").
                 arg(QDir::toNativeSeparators(executable)).arg(pid), LogMisc);
     m_hasDebuggee = true;