Bug 805080 - Remove unused CESU8 support from SpiderMonkey; r=luke

We have many CESU8 paths in SpiderMonkey which are completely unused and
untested. We have many more "UTF-8" paths which are really mislabled CESU8 paths
and visa-versa. This patch attempts to disentable all of the various encoding
options in SpiderMonkey.

js/xpconnect/shell/xpcshell.cpp

@@ -1039,7 +1039,7 @@ ProcessFile(JSContext *cx, JSObject *obj, const char *filename, FILE *file,
             }
             bufp += strlen(bufp);
             lineno++;
-        } while (!JS_BufferIsCompilableUnit(cx, false, obj, buffer, strlen(buffer)));
+        } while (!JS_BufferIsCompilableUnit(cx, obj, buffer, strlen(buffer)));
 
         DoBeginRequest(cx);
         /* Clear any pending exception from previous failed compiles.  */