README.qemu: fixed instructions
erlang: pass erl_xcomp_sysroot to configure

This is required for building the 'crypto', 'odbc', 'ssh'
and 'ssl' Erlang applications. These apps are skipped
regardless of whether they're enabled and their dependencies
can be met if this environment variable isn't set.

Signed-off-by: Frank Hunleth <fhunleth@troodon-software.com>
erlang: clean up staging and target

This removes a lot of files that were being put
in staging and target. Staging is clean up to
avoid referencing libraries that won't be available
on the target and to keep the release tools from
copying intermediate files around.