buildsys: cleanup libtool and autoconf initialization

- Use LT_INIT over AC_PROG_LIBTOOL, as the latter is a deprecated alias
  for the former.
- Remove redundant macros which are called implicitly by LT_INIT.
- Remove unneeded AC_PROG_CXX call (we don't use c++ anywhere)
- Add AC_CONFIG_MACRO_DIR([m4]) -- not strictly necessary, but added for
  consistency with autogen.sh and Makefile.am

ref: http://www.gnu.org/software/libtool/manual/html_node/LT_005fINIT.html

Signed-off-by: Dave Reisner <dreisner@archlinux.org>

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