tree.sh: delete individual target builds if needed

Detect when a config changes. This is done even if the
entire tree doesn't change.

This is already done per-tree if files change, but
individual project files don't change.

For example, if a grub.cfg changes, the given cached
build for that GRUB tree isn't deleted. Same thing if
a given U-Boot config doesn't change.

This patch fixes a longstanding design flaw of lbmk,
making auto-re-builds more reliable. This complements
another recent change, that deletes all target builds
of a given tree when the tree changes.

Signed-off-by: Leah Rowe <leah@libreboot.org>

0 files changed, 0 insertions, 0 deletions