buildgcc: Show the progress when downloading

Grep the output of wget, showing only the percentage.
Leave the final "100%" unerased.
Checking return code of wget is removed.

Change-Id: I4559e88d541738a594dce92e23589992f234cb9b
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/11520
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
1 file changed