Fix warnings in opmapcontrol

I looked at the latest version of opmapcontrol in OpenPilot. This has
not yet been fixed. So added pragma to silence.

libs/opmapcontrol/src/internals/projections/lks94projection.cpp

@@ -28,6 +28,11 @@
 #include <qmath.h>
 
 
+// These pragmas are local modifications to this third party library to silence warnings
+#ifdef Q_OS_LINUX
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#endif
 
 namespace projections {
 LKS94Projection::LKS94Projection():MinLatitude (53.33 ), MaxLatitude (56.55 ), MinLongitude (20.22 ),
@@ -787,3 +792,8 @@ Size LKS94Projection::GetTileMatrixMaxXY(int const& zoom)
 }
 
 }
+
+#ifdef Q_OS_LINUX
+#pragma GCC diagnostic pop
+#endif
+

libs/opmapcontrol/src/internals/projections/mercatorprojectionyandex.cpp

@@ -57,6 +57,16 @@ Point MercatorProjectionYandex::FromLatLngToPixel(double lat, double lng, const
  return ret;
 
 }
+
+// These pragmas are local modifications to this third party library to silence warnings
+#ifdef Q_OS_LINUX
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#elif defined(Q_OS_MAC)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-variable"
+#endif
+
 internals::PointLatLng MercatorProjectionYandex::FromPixelToLatLng(const int &x, const int &y, const int &zoom)
 {
  Size s = GetTileMatrixSizePixel(zoom);
@@ -82,6 +92,11 @@ internals::PointLatLng MercatorProjectionYandex::FromPixelToLatLng(const int &x,
 
  return ret;
 }
+
+#ifndef Q_OS_WIN
+#pragma GCC diagnostic pop
+#endif
+
 double MercatorProjectionYandex::Clip(const double &n, const double &minValue, const double &maxValue) const
 {
  return qMin(qMax(n, minValue), maxValue);