Back up the config files at the beginning of all.sh, rather than before each
component. In particular, create the backup before running cleanup for the
first time. This fixes#3139 (all.sh using a config.h.bak from a previous
job), and makes all.sh more robust against accidentally using a modified
config.h midway through because a component messed with the backup.
Use a different extension (*.all.bak rather than *.bak) for the backups.
This is necessary to ensure that auxiliary scripts such as depends*.pl that
make their own backup don't remove all.sh's backup, which the code from this
commit does not support.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
f83eb82a4d