configure.ac: remove unneeded AC_CONFIG_MACRO_DIR([m4])

Makefile.am already contains "ACLOCAL_AMFLAGS = -I m4",
that is enough for autoreconf to do the right thing.

Tested with
autoreconf -if && ./configure --enable-maintainer-mode && make && make distcheck

Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
2 files changed