Import bmake-20240508

Import bmake-20240508

Intersting/relevant changes since bmake-20240430

ChangeLog since bmake-20240430

2024-05-07  Simon J Gerraty  <sjg@beast.crufty.net>

	* VERSION (_MAKE_VERSION): 20240508
	Merge with NetBSD make, pick up
	o make: ensure variables set on command line get added to
	.MAKEOVERRIDES (even if they start with '.') so they are passed to
	sub-makes.

mk/ChangeLog since bmake-20240430

2024-05-04  Simon J Gerraty  <sjg@beast.crufty.net>

	* install-mk (MK_VERSION): 20240504

	* dirdeps.mk: allow BUILD_DIRDEPS_OVERRIDES to pass overrides to
	sub-make building DIRDEPS_CACHE.