Gets rid of these gcc 4.8 warnings:

dmxinit.c: In function ‘dmxErrorHandler’:
dmxinit.c:167:16: warning: format ‘%x’ expects argument of type ‘unsigned int’,
 but argument 3 has type ‘XID64’ [-Wformat=]
                ev->resourceid);
                ^
dmxinit.c:171:16: warning: format ‘%x’ expects argument of type ‘unsigned int’,
 but argument 3 has type ‘XID64’ [-Wformat=]
                ev->resourceid);
                ^
dmxinit.c:175:16: warning: format ‘%x’ expects argument of type ‘unsigned int’,
 but argument 3 has type ‘XID64’ [-Wformat=]
                ev->resourceid);
                ^
dmxinit.c:181:12: warning: format ‘%d’ expects argument of type ‘int’,
 but argument 3 has type ‘long unsigned int’ [-Wformat=]
            ev->serial);
            ^
dmxinit.c:183:12: warning: format ‘%d’ expects argument of type ‘int’,
 but argument 3 has type ‘long unsigned int’ [-Wformat=]
            dpy->request);
            ^
dmxinit.c: In function ‘InitOutput’:
dmxinit.c:637:9: warning: format ‘%d’ expects argument of type ‘int’,
 but argument 3 has type ‘long unsigned int’ [-Wformat=]
         dmxLog(dmxInfo, "Generation:         %d\n", dmxGeneration);
         ^

dmxprop.c: In function ‘dmxPropertyCheckOtherWindows’:
dmxprop.c:223:24: warning: format ‘%lu’ expects argument of type ‘long
 unsigned int’, but argument 4 has type ‘Window’ [-Wformat=]
                        dmxScreen->name, win, tp.value);
                        ^
dmxprop.c: In function ‘dmxPropertyWindow’:
dmxprop.c:364:16: warning: format ‘%lu’ expects argument of type ‘long
 unsigned int’, but argument 5 has type ‘Window’ [-Wformat=]
                other->index, other->name, other->scrnWin);
                ^
dmxprop.c:364:16: warning: format ‘%lu’ expects argument of type ‘long
 unsigned int’, but argument 8 has type ‘Window’ [-Wformat=]

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Rémi Cardona <remi@gentoo.org>
Reviewed-by: Keith Packard <keithp@keithp.com>