SKIP_DASHED_BUILT_INS: do not skip the bin/ programs

SKIP_DASHED_BUILT_INS: do not skip the bin/ programs

The idea of the `SKIP_DASHED_BUILT_INS` option is to stop hard-linking
the built-in commands as separate executables. The patches to do that
specifically excluded the three commands `receive-pack`,
`upload-archive` and `upload-pack`, though: these commands are expected
to be present in the `PATH` in their dashed form on the server side of
any fetch/push.

However, due to an oversight by myself, even if those commands were
still hard-linked, they were not installed into `bin/`.

Noticed-by: Michael Forney <mforney@mforney.org>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Reviewed-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>