dtcreate: Add missing prototypes and more (64-bit)

- Fix missing prototypes
- Fix some 64-bit related problems (XtVaGetValues)
- Fix crash on dtcreate startup in create_applicationShell1()
- Add XmeFlushIconFileCache() prototype from <Xm/IconFileP.h>

cde/include/Xm/XmPrivate.h

@@ -33,6 +33,8 @@ extern XmWidgetExtData _XmGetWidgetExtData(
 #else
                         unsigned char extType) ;
 #endif /* NeedWidePrototypes */
+/* Extracted from IconFileP.h */
+extern void XmeFlushIconFileCache(String	path);
 /* Extracted from MenuStateI.h */
 extern void _XmSetInDragMode(
                         Widget widget,

cde/include/Xm/extractprototype.awk

@@ -61,3 +61,4 @@ function proto() {
 /_XmShellIsExclusive/ { proto(); }
 /_XmTextFieldSetDestination/ { proto(); }
 /_XmGetActiveTopLevelMenu/ { proto(); }
+/XmeFlushIconFileCache/ { proto(); }