util/resolve: Save str[r]chr() ret val to const data ptr

With glibc-2.43 implementing the C23 standard, strrchr() and strchr()
now return "const char *" when its first argument is "const char *".

The fix is update all pointers receiving strrchr() and strchr()'s return
values so that they are now "const char *" instead of "char *".

Signed-off-by: Nicholas Vinson <nvinson234@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

util/resolve.c

@@ -138,12 +138,12 @@ read_dep_list (FILE *fp)
 static char *
 get_module_name (const char *str)
 {
-  char *base;
-  char *ext;
+  const char *base;
+  const char *ext;
 
   base = strrchr (str, '/');
   if (! base)
-    base = (char *) str;
+    base = str;
   else
     base++;
 
@@ -164,9 +164,9 @@ get_module_name (const char *str)
 static char *
 get_module_path (const char *prefix, const char *str)
 {
-  char *dir;
+  const char *dir;
   char *base;
-  char *ext;
+  const char *ext;
   char *ret;
 
   ext = strrchr (str, '.');