Unfortunately this patch is hard to split up into smaller chunks. Our build
system and the associated automake/autoconf/libtool macros has been left
untouched for a while, and could use a refresher.
* Upgrade ltmain.sh to the latest version
* Move away from a huge acinclude.m4 directory to using individual files in
the m4/ subdirectory, suggested by upstream automake documentation
* Update all macros to their latest available version
* Adjust Makefile.am and autogen.sh to accommodate m4/ subdirectory
Signed-off-by: Dan McGee <dan@archlinux.org>
