buildgcc: support pigz and lbzip2 decpmpressors if installed.

These are multi-threaded decompressors for .gz and .bz2 compressed
files.  If they're installed, use them to decompress, if they're not,
use the standard single-threaded decompressors.

Change-Id: I397740817e6b234a43b62075899964bdab14f121
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14146
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed