Invoke libtoolize before aclocal.

libtoolize was overwriting m4/libtool.m4, which aclocal.m4 depended on
and needed aclocal to update. This caused the autotools files to be
updated, triggering a second configure run on first build.

autogen.sh

@@ -41,8 +41,8 @@ fi
 
 set -ex
 
-aclocal -I m4
 $LIBTOOLIZE --copy --force
+aclocal -I m4
 autoheader
 automake --add-missing --copy --foreign
 autoconf