Remove libtoolize from autogen

We don't need libtool support, so remove libtoolize from the autogen
script (and create build-aux to prevent errors when installing missing
components required by automake).

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>

autogen.sh

@@ -1,15 +1,6 @@
 #!/bin/sh
 
-if `which libtoolize` ; then
-	libtoolize
-# on, e.g., Darwin
-elif `which glibtoolize` ; then
-	glibtoolize
-else
-	echo "libtoolize not found!"
-	exit 1
-fi
-
+mkdir -p build-aux
 aclocal
 autoconf
 automake --add-missing