This change allows to apply OpenWrt, Buildroot and OE libtool fixes to packages which fail badly at autoreconf.
The fixup covers the common libtool versions 1.5, 2.2 and 2.4 and automatically determines the correct
version to use.
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@27855 3c298f89-4303-0410-b956-a3cf2f4a3e73
