Remove format warnings.

src/main.cpp

@@ -89,7 +89,7 @@ int main(int argc, char *argv[])
         app.installTranslator(&translator);
     }
 
-    qDebug("Starting main thread: 0x%016" PRIxPTR, (quintptr)QThread::currentThreadId());
+    qDebug("Starting main thread: 0x%016" PRIxPTR, (uintptr_t)QThread::currentThreadId());
 
     // set the organization/application for QSettings to work properly
     app.setOrganizationName("qcma");