add patch by Sergey Kosukhin to use autogen.sh with libtool higher than 2.4.2

autogen.sh

@@ -4,7 +4,7 @@ verlte() {
     [  "$1" = "`echo -e "$1\n$2" | sort -V | head -n1`" ]
 }
 
-autoreconf -fvi
+autoreconf -fvi || exit $?
 
 libtool_version=`libtool --version | awk 'NR==1 {print $4}'`
 
@@ -14,8 +14,10 @@ verlte $libtool_version 2.4.2 && {
   patch --forward --no-backup-if-mismatch -p0 -s -l < maint/libtool.m4.patch
 
   # rebuild configure
-  autoconf -f || exit 1
+  autoconf -f || exit $?
 
   # Reset libtool.m4 timestamps to avoid confusing make 
   touch -r m4/ltversion.m4 m4/libtool.m4
-}
\ No newline at end of file
+}
+
+exit 0