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/procinterrupt.h

@@ -36,7 +36,7 @@
 namespace Debugger {
 namespace Internal {
 
-bool interruptProcess(int pID, int engineType, QString *errorMessage,
+bool interruptProcess(qint64 pID, int engineType, QString *errorMessage,
                       const bool engineExecutableIs64Bit = false);
 
 } // Internal