crossgcc: Continue to unpack archive if it was incomplete

If the unpacking was interrupt by Ctrl-C, probably part of
an archive is unpacked. If we run buildgcc again, the
incomplete folder would be and skipped.

We can create a file to tell the script the unpacking is done.

Change-Id: Id9eb74d119e22b62c70dca9b38a92c3dbdf0f64c
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/4512
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

0 files changed, 0 insertions, 0 deletions