Re: byte compilation in older emacs [patch]

Sigh. I failed to note that vc-dwim did not dwim; my summary first line
was once again not recognized. (And I guess I should update the date.)
I'll figure that out before pushing, but anyway, the content of the
patch is what really needs review. Here's the actual ChangeLog entry as
written ... -k

2020-01-03  Karl Berry  <[email protected]>

	automake: Support byte compilation in older Emacsen

	* lib/am/lisp.am (am__emacs_byte_compile_setup) [FIRST]: define
	new make variable, to use byte-compile-dest-file-function if
	available, else byte-compile-dest-file.
	(.el.elc): use it.
	* t/lisp-loadpath.sh: skip test if emacs version is <= 23,
	since their -L ordering is backwards.
	* NEWS: update.