Fix autotools to include the necessary m4 files

Fix autotools to include the necessary m4 files

Running autogen.sh with a new version of autotools and then building
on a system with an older version tends to explode.  Unfortunately
this is sometimes necessary since the new version is required by the
package.  The fix changes the autogen.sh output from:

    + aclocal -I config
    + libtoolize --force --copy
    libtoolize: putting auxiliary files in AC_CONFIG_AUX_DIR, `config'.
    libtoolize: copying file `config/ltmain.sh'
    libtoolize: Consider adding `AC_CONFIG_MACRO_DIR([m4])' to configure.in and
    libtoolize: rerunning libtoolize, to keep the correct libtool macros in-tree.
    libtoolize: Consider adding `-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
    + autoheader
    + automake --foreign --add-missing --copy
    + autoconf

to:

    + aclocal -I config
    + libtoolize --force --copy
    libtoolize: putting auxiliary files in AC_CONFIG_AUX_DIR, `config'.
    libtoolize: copying file `config/ltmain.sh'
    libtoolize: putting macros in AC_CONFIG_MACRO_DIR, `config'.
    libtoolize: copying file `config/libtool.m4'
    libtoolize: copying file `config/ltoptions.m4'
    libtoolize: copying file `config/ltsugar.m4'
    libtoolize: copying file `config/ltversion.m4'
    libtoolize: copying file `config/lt~obsolete.m4'
    + autoheader
    + automake --foreign --add-missing --copy
    + autoconf

And fixes various build problems in weird cases.

This is how GNU envisions this mess works at least...

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>