157 warnings: remove -DXK_MISCELLANY from Makefiles

Fixes the following warning:

In file included from ../../../imports/x11/include/X11/Xutil.h:54,
                 from ../../../imports/x11/include/X11/Intrinsic.h:54,
                 from Action.c:64:
../../../imports/x11/include/X11/keysym.h:49:1: warning: "XK_MISCELLANY" redefined
<command-line>: warning: this is the location of the previous definition

<keysym.h> which includes all key symbols and loads <keysymdef.h>
is automaticlly included by the X Toolkit.

This patch removes #include <keysymdef.h> whenever not needed,
and adds #define XK_MISCALLANY in the source code where required.

cde/programs/dtfile/Main.c

@@ -152,7 +152,6 @@
 #include <X11/Shell.h>
 #include <X11/Xatom.h>
 #include <Xm/Protocols.h>
-#include <X11/keysymdef.h>
 #ifdef HAVE_EDITRES
 #include <X11/Xmu/Editres.h>
 #endif
@@ -999,7 +998,6 @@ main(
    XtInputMask pending;
    Boolean eventDebugging;
    int offset;
-   KeySym keysym;
    int displayHeight;
    int displayWidth;
    Arg args[10];