IMPALA-9237: Make package binutils building work on aarch64
IMPALA-9237: Make package binutils building work on aarch64

Set correct environment variables for compiler on aarch64 to make
sure binutils building success on aarch64.

Change-Id: I08dbe29357a191b0bfd96a76d1f9d58616880905
Reviewed-on: http://gerrit.cloudera.org:8080/14888
Reviewed-by: Tim Armstrong <2f8e34250f03a653da3dc27f7ec203eafdde80fc@cloudera.com>
Tested-by: Tim Armstrong <2f8e34250f03a653da3dc27f7ec203eafdde80fc@cloudera.com>

cloudera/native-toolchain,cloudera/native-toolchain,timarmstrong/native-toolchain,cloudera/native-toolchain