This adds the basic config bits needed for OpenBSD.

Patch from Pascal Stumpf <Pascal.Stumpf@cubes.de>

Most is just copied from the existing imake installation in
/usr/X11R6.  Additionally:

* Allow overriding CDESharedRev, X11ProjectRoot and ProjectRoot
* Add a new define to be able to override MINCLUDESRC too

(this allows me to build CDE without symlinking any include directories)

cde/config/cf/Motif.tmpl

@@ -442,12 +442,17 @@ TOP_MOTIF_INCLUDES = -I$(MINCLUDESRC)
 /* MTOOLKITSRC  should be removed */
     MTOOLKITSRC = $(TOOLKITSRC)
 #if ImportMotif || UseInstalledMotif
-    MINCLUDESRC = $(MTOP)/include
         MDOCSRC = $(MTOP)/doc
         MLOCSRC = $(MTOP)/localized
 #else
-    MINCLUDESRC = $(MTOP)/exports/include
         MLOCSRC = $(MTOP)/exports/localized
+#endif
+#if defined(TopMotifInclude)
+    MINCLUDESRC = TopMotifInclude
+#elif ImportMotif || UseInstalledMotif
+    MINCLUDESRC = $(MTOP)/include
+#else
+    MINCLUDESRC = $(MTOP)/exports/include
 #endif
         MLIBSRC = $(MTOP)/lib
      MCLIENTSRC = $(MTOP)/clients