Consistently use ${abs_top_srcdir:-../../..} in test_rust.sh

Sometimes we just use ${abs_top_srcdir}

changed milestone to %Tor: 0.3.5.x-final

added 034-backport 034-removed-20180328 034-triage-20180328 035-removed-20180711 component::core tor/tor fast-fix milestone::Tor: 0.3.5.x-final not-just-linux owner::teor parent::24629 priority::medium resolution::implemented reviewer::catalyst severity::normal status::closed teor-was-assigned tor-ci type::defect version::tor 0.3.4.3-alpha labels

I put a patch for this in my #24629 (moved) branch.

Trac:
Version: Tor: unspecified to Tor: 0.3.4.3-alpha
Status: assigned to needs_review

Trac:
Reviewer: N/A to catalyst

Trac:
Status: needs_review to merge_ready

Closing these because the parent (#24629 (moved)) is now merged.

Trac:
Status: merge_ready to closed
Resolution: N/A to implemented

closed

moved to tpo/core/tor#27093 (closed)