[fix] global: disable OpenCL

Disable OpenCL globally to fix memory leaks on Windows and to increase performance.

FastTrack.pri

@@ -1 +1 @@
-VERSION = 6.2.4.1
+VERSION = 6.2.4.2

src/fasttrack-cli.cpp

@@ -100,6 +100,8 @@ All arguments are mandatory except --backPath and --cfg. Loading a configuration
 }
 
 int main(int argc, char **argv) {
+  char env[] = "OPENCV_OPENCL_DEVICE=disabled";
+  putenv(env);  // disable OpenCL to fix windows memory leaks and increase performance
   static struct option long_options[] =
       {
           {"maxArea", required_argument, 0, 'a'},

src/main.cpp

@@ -15,6 +15,7 @@ This file is part of Fast Track.
     along with FastTrack.  If not, see <https://www.gnu.org/licenses/>.
 */
 
+#include <stdlib.h>
 #include <QApplication>
 #include <QDir>
 #include <QFont>
@@ -34,6 +35,8 @@ void messageHandler(QtMsgType type, const QMessageLogContext &context, const QSt
 }
 
 int main(int argc, char *argv[]) {
+  char env[] = "OPENCV_OPENCL_DEVICE=disabled";
+  putenv(env);  // disable OpenCL to fix windows memory leaks and increase performance
   QApplication a(argc, argv);
   QPixmap pixmap(QStringLiteral(":/assets/icon.png"));
   QSplashScreen splash(pixmap);