0.9.10.39:

0.9.10.39:
	Implement and document SB-EXT:*CORE-PATHNAME*.
	... communicate from runtime via SB-INT:*CORE-STRING*, rather
		than constructing a pathname in C.

	Related refactoring.
	... since OS-COLD-INIT-OR-REINIT has exactly the same
		functionality on all currently supported platforms,
		move it into a common file;
	... define common *common-static-symbols* and
		*c-callable-static-symbols* for use in constructing
		the per-backend *static-symbols* list, and to remove
		the need for maintaining a separate list of callable
		symbols in genesis.