Makefile: use order-only prereq for podman-remote

podman-remote has a dependency on $(SRCBINDIR), because on
Mac and Windows that's a special dir that may not exist.
But depending on a directory means depending on its mtime,
which changes every time a file in it is updated, which
means running 'make' twice in a row will rebuild podman-remote
for no good reason.

Solution: GNU Make has the concept of "order-only" prerequisites,
precisely for this situation. Use it. Since it's an obscure
feature, document it.

UPDATE: This exposed some nasty duplication wrt podman-remote rules.
Clean those up, and add comments to some confusing sections.

Fixes: #14756

(Also, drive-by edit to remove a stray misdocumented non-option)

Signed-off-by: Ed Santiago <santiago@redhat.com>

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