The OpenBLAS Makefile only handles large.tgz and timing.tgz and ignores
lapack-x.y.z.tgz. We need to manually unpack the lapack-x.y.z specified
in the easyconfig.

Doing it this way makse it possible to add patches on top of the
unpacked lapack version, which is neccesary to deal with various
compiler problems.

Also don't keep a copy of the old lapack-netlib.

…0.2.18 & 0.2.19