autogen.sh: Fix check for libtool (we only need libtoolize)

A pre-built libtool copy may not be installed on all systems; all
we need is libtoolize.

Signed-off-by: David Zeuthen <zeuthen@gmail.com>

diff --git a/autogen.sh b/autogen.sh
index 426e875..d08b00a 100755 (executable)
--- a/autogen.sh
+++ b/autogen.sh
@@ -26,7 +26,7 @@ touch ChangeLog
 }
 
 (grep "^AM_PROG_LIBTOOL" configure.ac >/dev/null) && {
-  (libtool --version) < /dev/null > /dev/null 2>&1 || {
+  (libtoolize --version) < /dev/null > /dev/null 2>&1 || {
     echo
     echo "**Error**: You must have libtool installed."
     echo "You can get it from: ftp://ftp.gnu.org/pub/gnu/"