autotools: use glibtoolize on Mac OSX

autogen.sh

@@ -1,5 +1,11 @@
 #!/bin/sh
 
+LIBTOOLIZE=`which libtoolize`
+if ! test -f "$LIBTOOLIZE" ; then
+	# Mac OSX support ...
+	LIBTOOLIZE=`which glibtoolize`
+fi
+
 mkdir -p m4
 touch AUTHORS
 touch NEWS
@@ -7,7 +13,7 @@ ln -svf README.md README
 
 aclocal -I m4 || exit 1
 
-libtoolize || exit 1
+${LIBTOOLIZE} || exit 1
 autoheader || exit 1
 automake --add-missing || exit 1
 autoconf || exit 1