Update build system (automake, autoconf, libtool)

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>

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