Use modern AC_INIT in configure.in

[Alan Modra]

On Tue, Jul 08, 2014 at 08:38:30AM -0700, H.J. Lu wrote:
> The old one has
> 
> changequote(,)dnl
> BFD_VERSION=`${srcdir}/../bfd/configure --version | sed -n -e '1s,.* ,,p'`
> changequote([,])dnl
> AM_INIT_AUTOMAKE(ld, ${BFD_VERSION})
> 
> When BFD_VERSION is changed, we only need to regenerate
> configure in bfd.  Can we make it to work with the new scheme?

You can, by using m4_esyscmd to extract the version from
bfd/configure.ac to set versions in other configure dirs, but that way
is a bit messy.  I wrote it like that at first, then saw that the
automake docs recommend using an m4 version file.

-- 
Alan Modra
Australia Development Lab, IBM