Use _CONST_X_STRING to make libXt declare String as const char *

Clears 169 out of 240 -Wdiscarded-qualifiers warnings from gcc 7.3

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/BitmapP.h b/BitmapP.h
index 08e4c65..2ab711e 100644
--- a/BitmapP.h
+++ b/BitmapP.h
@@ -119,7 +119,8 @@ typedef struct {
   Dimension        margin, squareW, squareH, width, height;
   XPoint           hot;
   int              button_function[5];
-  String           filename, basename;
+  _XtString        filename;
+  _XtString        basename;
   /* private state */
   String           size;
   Position         horizOffset, vertOffset;