Make js_GetScriptLineExtent JS_FRIEND_API for the js shell's sake.

js/src/jsscript.c

@@ -1278,7 +1278,7 @@ out:
     return script->code + offset;
 }
 
-uintN
+JS_FRIEND_API(uintN)
 js_GetScriptLineExtent(JSScript *script)
 {
     uintN lineno;

js/src/jsscript.h

@@ -162,7 +162,7 @@ js_PCToLineNumber(JSContext *cx, JSScript *script, jsbytecode *pc);
 extern jsbytecode *
 js_LineNumberToPC(JSScript *script, uintN lineno);
 
-extern uintN
+extern JS_FRIEND_API(uintN)
 js_GetScriptLineExtent(JSScript *script);
 
 /*