Avoids compiler warning:
src/wmgtemp.c: In function ‘main’:
src/wmgtemp.c:202:50: warning: pointer targets in passing argument 4 of ‘openXwindow’ differ in signedness [-Wpointer-sign]
openXwindow(argc, argv, wmgtemp_interface_xpm, wmgtemp_interface_mask_bits,
^
In file included from src/wmgtemp.c:15:0:
/usr/include/libdockapp/wmgeneral.h:78:6: note: expected ‘char *’ but argument is of type ‘unsigned char *’
void openXwindow(int argc, char *argv[], char **, char *, int, int);
^
