dtfile: Add missing prototypes

Add missing prototypes and header files to the dtfile
code in order to move closer towards 64-bit compatibility.

Extract the following functions from Motif internal headers:

_XmGetWidgetExtData
_XmRecordEvent
_XmStringUngenerate
_XmTextFieldSetDestination
_XmGetActiveTopLevelMenu

Extract manually prototypes of the obsolete Motif interface:
_XmHighlightBorder
_XmUnhighlightBorder

Remove XmPrivate.h if extractprototype.awk fails

Make the following header files available via -I:
	codelibs/boolean.h
	codelibs/pathutils.h
	codelibs/shellutils.h
and remove shellutils.h from dtwm directory.

cde/lib/DtSvc/DtUtil2/Connect.h

@@ -37,6 +37,7 @@
 
 #include <Dt/DtP.h>
 #include <bms/connect.h>
+#include <codelibs/pathutils.h>
 
 #define DtGetShortHostname Xegetshorthostname
 #define DtGetHostname      Xegethostname

cde/lib/DtSvc/include/Imakefile

@@ -2,7 +2,7 @@ XCOMM $TOG: Imakefile /main/3 1998/08/10 18:02:40 mgreess $
 #define IHaveSubdirs
 #define PassCDebugFlags 'CDEBUGFLAGS=$(CDEBUGFLAGS)' 'CXXDEBUGFLAGS=$(CXXDEBUGFLAGS)'
 
-SUBDIRS = bms SPC
+SUBDIRS = bms codelibs SPC
 
 MakeSubdirs($(SUBDIRS))
 DependSubdirs($(SUBDIRS))

cde/lib/DtSvc/include/codelibs/Imakefile

@@ -0,0 +1,11 @@
+
+HEADERS = pathutils.h boolean.h shellutils.h
+
+all::
+
+BuildIncludes($(HEADERS),codelibs,..)
+InstallMultipleFlags($(HEADERS),$(INCDIR)/codelibs,$(INSTINCFLAGS))
+
+depend::
+
+clean::