Install patches from David J. Mackenzie to make the srcdir option

Install patches from David J. Mackenzie to make the srcdir option
	work.
	* Makefile.in (srcdir, VPATH): Get this value from the top-level
	Makefile.
	(INSTALLABLES): Split this into two lists - INSTALLABLES and
	INSTALLABLE_SCRIPTS.
	(INSTALLABLE_SCRIPTS): New list.
	(EXECUTABLES): Include INSTALLABLE_SCRIPTS.
	(${archlibdir}): The scripts to be installed live in the source
	tree, not in the object tree.
	(test-distrib): Note that the data file lives in the source tree,
	not the object tree.
	(GETOPTDEPS): Note that getopt.h lives in the source tree.
	(all other targets): Change references to source files to use
	${srcdir}, except for config.h, which lives in the object dir.
	(timer.o): Note that this depends on ../src/config.h.
	* make-docfile.c (main): Add a -d option, to tell it where to find
	the source files.
	* test-distrib.c (main): Take the name of the distribution file to
	test from the command line.