Fix warnings in dtwm

- Improve pointer/int compatibility
- Include unpublished Dt headers in Dt
- Use <Xm/XmPrivate.h> for unpublished Motif functions

There are still warnings left generated because
ElementValue.parsed_value should really be a union.

There are also some warnings left because of XtPointer
casting and some unused variables and functions.

cde/programs/dtwm/Dt/shellutils.h

@@ -0,0 +1,56 @@
+/*
+ * CDE - Common Desktop Environment
+ *
+ * Copyright (c) 1993-2012, The Open Group. All rights reserved.
+ *
+ * These libraries and programs are free software; you can
+ * redistribute them and/or modify them under the terms of the GNU
+ * Lesser General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * These libraries and programs are distributed in the hope that
+ * they will be useful, but WITHOUT ANY WARRANTY; without even the
+ * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See the GNU Lesser General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with these librararies and programs; if not, write
+ * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
+ * Floor, Boston, MA 02110-1301 USA
+ */
+/*
+ * File:	shellutils.h $XConsortium: shellutils.h /main/3 1995/10/26 16:13:31 rswiston $
+ *
+ * (c) Copyright 1993, 1994 Hewlett-Packard Company
+ * (c) Copyright 1993, 1994 International Business Machines Corp.
+ * (c) Copyright 1993, 1994 Sun Microsystems, Inc.
+ * (c) Copyright 1993, 1994 Novell, Inc.
+ */
+
+#ifndef __SHELLUTILS_H_
+#define __SHELLUTILS_H_
+
+#ifdef __cplusplus
+extern "C"
+{
+    char const *const *shellscan(char const *str, int *argc = (int *)0,
+	    unsigned opts = 0);
+}
+#else
+    extern char **shellscan();
+#endif
+
+#define SHX_NOGLOB	0x0001
+#define SHX_NOTILDE	0x0002
+#define SHX_NOVARS	0x0004
+#define SHX_NOQUOTES	0x0008
+#define SHX_NOSPACE	0x0010
+#define SHX_NOMETA 	0x0020
+#define SHX_NOCMD	0x0040
+#define SHX_COMPLETE	0x0080
+
+#define SHX_NOGRAVE	0x0040		/* Obsolete, use NOCMD */
+
+#endif /* __SHELLUTILS_H_ */