AAAARG

libtool 1.4.3 is scary as hell and caused just about every build on all sorts
of platforms to stop working, thanks to the fact that it ruquires a SED
variables somehow set by the configure script. It works fine on my linux
running autoconf 2.57 and automake 1.7 but others seem not to do as fine.

Reverting back to the ltmain.sh we had previously, which I believe is 1.4.2
including handmade patches for FreeBSD.

ALERT ALERT ALERT before we try 1.4.3 or similar versions again, check the
${SED} stuff and similar carefully.