Revert "tools lib lk: Fix for cross build"

This reverts commit 079787f209416416383c74ea5d5044be2d586f5e.

Below commit already resolve a cross build problem.
I have been noticed this too lately.

    commit 3c4797d46c14fa0c7cf733a77bd4b28875078b53
    Author: Rabin Vincent <rabin@rab.in>
    Date:   Fri May 17 22:27:44 2013 +0200

    tools lib lk: Respect CROSS_COMPILE

    Make lk use CROSS_COMPILE, in order to be able to cross compile perf
    again.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1373936614-22224-1-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>