build-unit-test-docker: boost: switch mirror to yocto

The official download location for boost, bintray, often runs out
of bandwidth and gives errors when we download from it.  Switch
our download location to be the yoctoproject mirror instead, which
seems to be more stable.

The downside of this is that we can only use Boost releases which
are already incorporated into a Yocto commit, but we really should
only do that anyhow.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ia028ed18d7ef4b9d2a0cc3ca351cee27073ad6bc
1 file changed