[PATCH 0 of 2] minor build and INSTALL fixes

[Matthias Andree <matthias.andree@xxxxxx>]

Patch 1 removes a file from the repo that is installed by autoreconf
as part of prepare.

Patch 2 updates the VPATH information in INSTALL. I have been using
VPATH (i. e. mkdir build ; cd build ; ../configure ...) for quite a
while with the repository versions. No ill effects observed with a
recent GNU make.