Revert "libbinder: Don't redefine B_PACK_CHARS"

#ifndef ANDROID_IBINDER_H

#define ANDROID_IBINDER_H

#include <cstdlib>  // Defines types needed for linux/binder.h

#include <linux/binder.h>  // Needed for B_PACK_CHARS

#include <utils/Errors.h>

#include <utils/RefBase.h>

#include <utils/String16.h>

#include <utils/Vector.h>

#ifndef B_PACK_CHARS

#error "linux/binder.h no longer defines B_PACK_CHARS"

#endif

#define B_PACK_CHARS(c1, c2, c3, c4) \

    ((((c1)<<24)) | (((c2)<<16)) | (((c3)<<8)) | (c4))

// ---------------------------------------------------------------------------

namespace android {