tools lib lk: Respect CROSS_COMPILE

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

Change-Id: I2121f00d52c05477196bad4545b84f265d4edb19
Signed-off-by: Rabin Vincent <rabin@rab.in>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1368822464-4887-1-git-send-email-rabin@rab.in


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Git-commit: 3c4797d46c14fa0c7cf733a77bd4b28875078b53
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Neil Leeder <nleeder@codeaurora.org>