Use _CONST_X_STRING to make libXt declare String as const char *

Clears gcc 7.3 warnings of:

appres.c: In function ‘main’:
appres.c:36:16: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
 #define NONAME "-AppResTest-"
                ^
appres.c:126:20: note: in expansion of macro ‘NONAME’
     String iname = NONAME, cname = NONAME;
                    ^~~~~~
appres.c:36:16: warning: initialization discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
 #define NONAME "-AppResTest-"
                ^
appres.c:126:36: note: in expansion of macro ‘NONAME’
     String iname = NONAME, cname = NONAME;
                                    ^~~~~~

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

1 files changed, 3 insertions, 1 deletions

diff --git a/appres.c b/appres.c
index fad870f..e546ac0 100644
--- a/appres.c
+++ b/appres.c
@@ -29,6 +29,8 @@ in this Software without prior written authorization from The Open Group.
 # include "config.h"
 #endif
 
+#define _CONST_X_STRING
+
 #include <X11/Intrinsic.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -123,7 +125,7 @@ int
 main (int argc, char *argv[])
 {
     Widget toplevel;
-    char *iname = NONAME, *cname = NONAME;
+    String iname = NONAME, cname = NONAME;
     XtAppContext xtcontext;
     XrmName names[101];
     XrmClass classes[101];