gitignore: ignore the crossgcc/build-{arch}-{archive}

The architecture information has been added to the folders to
build archives for crossgcc. We need to change the .gitignore
to keep ignoring them.

Change-Id: Ic18685e507f1b09088120eee6047d49141e29906
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/4513
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
1 file changed