Parallel MinGW build broke in clucene every now and then because the
link target tried to put map file directly into $(OUTDIR)/bin, which did
not exist yet (and actually nothing in Library depends on it, so I guess
it was just luckily created in time by delivery of soltools in the cases
where the build succeeded).

The map file is now created in $(WORKDIR) (as it should be) and then
delivered through AUXTARGETS.

Change-Id: I62373f0b71a6c4f3b59fa779f9ec48154485a174