amend change to XawListChange()
My previous commit in July 2019
build-fixes when _CONST_X_STRING is defined
modified the interface of XawListChange() to use "_Xconst char *" to fix builds when the Xt symbol _CONST_X_STRING is defined (which makes the String typedef "const").
While this fixed building Xaw, clients which use Xaw were impacted. Changing that function to use String resolves both problems.
(report by Karl Berry).
Signed-off-by: Thomas E. Dickey dickey@invisible-island.net