Option to create the character deaf

Allows creating your character permanently deaf,
for that added challenge.

Breaks saves.

include/you.h

@@ -160,6 +160,7 @@ struct u_conduct {     /* number of times... */
 struct u_roleplay {
     boolean blind;  /* permanently blind */
     boolean nudist; /* has not worn any armor, ever */
+    boolean deaf;   /* permanently deaf */
     long numbones;  /* # of bones files loaded  */
 };