r14052: Remove BASEDIR use in the Makefile. BASEDIR=prefix=@prefix@ till now.

r14052: Remove BASEDIR use in the Makefile.  BASEDIR=prefix=@prefix@ till now.
I suggest to stay with ^BASEDIR= @prefix@$ for at least the next release
to give external projects - like samba-vscan project - time to adopt
this change.

BASEDIR is non of the default autoconf variables.  prefix is.

Jerry1: If possible please announce this with the next release.  I'll
self reply to technical.

Jerry2: This does not break your makepkg stuff as you set BASEDIR
_not_ from the Makefile.
(This used to be commit 730d5ec22948c579a81137051134657043c34415)