feat(edit)!: remove old c implementation of hebrew keymap

This feature has long been obsolete. The 'keymap' option can be used
to support language keymaps, including hebrew and hebrewp (phonetic
mapping). There is no need to keep the old c code with hardcoded
keymaps for some languages.

src/nvim/normal.c

@@ -769,10 +769,6 @@ static void normal_get_additional_char(NormalState *s)
 
       // adjust chars > 127, except after "tTfFr" commands
       LANGMAP_ADJUST(*cp, !lang);
-      // adjust Hebrew mapped char
-      if (p_hkmap && lang && KeyTyped) {
-        *cp = hkmap(*cp);
-      }
     }
 
     // When the next character is CTRL-\ a following CTRL-N means the