xbmk: cache builds in XBMK_CACHE/elf/

not elf/

this way, release builds will go faster because
we re-use cached builds which are, due to recent
design improvements, always reliably re-built and
we can be sure that what's cached matches what's
currently in config/

if ./mk release is done with uncommitted changes,
that's OK because the hash checking is still done
in the release directory, which would still make
builds be re-done, and this would then update the
hashes so the master tree would then re-build them
later on, when doing a non-release build.

this change enables more rapid release build testing,
because we don't needlessly repeat certain builds.

we still generate the source archive from a clean slate.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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