MacOS X (Darwin) specific tweaks.

tcshrc.prompt.defs

@@ -105,12 +105,6 @@ foreach ch ($referencechars_raw)
     set referencechars=( $referencechars `printf "${unicode}"` )
 end
 
-if( $CSHENV_SYSTEM == "Darwin" ) then
-    # Macos seems to dislike using printf to construct unicode chars.
-    # So you get a dumb set of ABCDXYZ
-    set referencechars="A B C D X Y Z"
-endif
-
 # Rotation
 alias precmd 'source ${CSHENV_DIR}/tcshrc.prompt.final'
 #alias postcmd echo doit