bfd: update to AC_INIT

bfd: update to AC_INIT

Move the package name/version from AM_INIT_AUTOMAKE to AC_INIT per recent
autotools guidelines.  We use recent versions of both, so it shouldn't be
a problem.

This sets PACKAGE_xxx variables correctly, and makes the output of:
	./configure --version
actually useful:
	bfd configure 2.22.52

Changing the other dirs to use AC_INIT would require a bit of m4 trickery
that I don't feel like getting into, and they all use BFD_VERSION anyways,
so there isn't much point.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>