libobjc: Move sendmsg.c to the new API

[Nicola Pero]

This patch changes libobjc/sendmsg.c to use the new GNU Objective-C Runtime API.

Committed to trunk.

Thanks

2010-12-16  Nicola Pero  <nicola.pero@meta-innovation.com>

        * sendmsg.c: Include objc/runtime.h instead of objc/objc-api.h.
        Include objc-private/module-abi-8.h and objc-private/selector.h
        instead of objc/encoding.h.
        (objc_msg_lookup_super): Use super->super_class instead of
        super->class.
        (method_get_first_argument, method_get_next_argument): Declare
        locally.
        (class_get_instance_method): Declare before using.
        (objc_msg_sendv): Use 'struct objc_method' instead of 'Method'.
        (__objc_init_dispatch_tables, __objc_send_initialize): Use
        sel_registerName() instead of sel_register_name().
        (__objc_forward): Use sel_getName() instead of sel_get_name().
        (objc_get_uninstalled_dtable): Use 'void' as argument.
        * objc-private/selector.h: New.
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