Amends the following compiler warnings:

 ```
 Screen.c: In function ‘nxagentCreateIconWindow’:
 Screen.c:394:15: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘Window’ [-Wformat=]
                nxagentIconWindow);
                ^
 Screen.c: In function ‘nxagentSetScreenSaverTime’:
 Screen.c:456:19: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘CARD32’ [-Wformat=]
                    ScreenSaverTime, ScreenSaverInterval);
                    ^
 Screen.c:456:19: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘CARD32’ [-Wformat=]
 Screen.c:476:19: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘CARD32’ [-Wformat=]
                    ScreenSaverTime, ScreenSaverInterval);
                    ^
 Screen.c:476:19: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘CARD32’ [-Wformat=]
 Screen.c: In function ‘nxagentOpenScreen’:
 Screen.c:1234:19: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘VisualID’ [-Wformat=]
                    visuals[numVisuals].vid);
                    ^
 Screen.c:1274:23: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘VisualID’ [-Wformat=]
                        depths[depthIndex].depth);
                        ^
 Screen.c:1282:17: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘VisualID’ [-Wformat=]
                  defaultVisualIndex, visuals[defaultVisualIndex].vid);
                  ^
 Screen.c:1319:19: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 6 has type ‘VisualID’ [-Wformat=]
                    rootDepth, defaultVisual);
                    ^
 Screen.c:1336:19: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 6 has type ‘VisualID’ [-Wformat=]
                    rootDepth, defaultVisual);
                    ^
 Screen.c:1348:19: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 6 has type ‘VisualID’ [-Wformat=]
                    rootDepth, defaultVisual);
                    ^
 Screen.c:1357:19: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 6 has type ‘VisualID’ [-Wformat=]
                    rootDepth, defaultVisual);
                    ^
 Screen.c:1723:21: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘Window’ [-Wformat=]
                      nxagentDefaultWindows[pScreen->myNum]);
                      ^
 Screen.c:1763:19: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘Window’ [-Wformat=]
                    nxagentDefaultWindows[pScreen->myNum]);
                    ^
 Screen.c:1775:17: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘Window’ [-Wformat=]
                  nxagentDefaultWindows[pScreen->myNum]);
                  ^
 Screen.c:1790:17: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘Window’ [-Wformat=]
                  nxagentDefaultWindows[pScreen->myNum]);
                  ^
 Screen.c: In function ‘nxagentShadowAdaptDepth’:
 Screen.c:3189:14: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 3 has type ‘long unsigned int’ [-Wformat=]
               pVisual -> red_mask, pVisual -> green_mask, pVisual -> blue_mask);
               ^
 Screen.c:3189:14: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 4 has type ‘long unsigned int’ [-Wformat=]
 Screen.c:3189:14: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 5 has type ‘long unsigned int’ [-Wformat=]
 Screen.c:3198:15: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 3 has type ‘long unsigned int’ [-Wformat=]
                redMask, greenMask, blueMask);
                ^
 Screen.c:3198:15: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 4 has type ‘long unsigned int’ [-Wformat=]
 Screen.c:3198:15: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 5 has type ‘long unsigned int’ [-Wformat=]
 ```