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configure: Use LT_INIT from libtool 2 instead of deprecated AC_PROG_LIBTOOL

Alan Coopersmith requested to merge alanc/libxmu:config into master

AC_PROG_LIBTOOL was replaced by LT_INIT in libtool 2 in 2008, so it's time to rely on it.

Clears autoconf warnings:

configure.ac:13: warning: The macro `AC_PROG_LIBTOOL' is obsolete.
configure.ac:13: You should run autoupdate.
aclocal.m4:3465: AC_PROG_LIBTOOL is expanded from...
configure.ac:13: the top level

libtoolize: Consider adding 'AC_CONFIG_MACRO_DIRS([m4])' to configure.ac,
libtoolize: and rerunning libtoolize and aclocal.

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