www/osrm-backend: Update to 5.15.3
Changes from 5.15.2:
- Bugfixes: fix deduplication of route steps when waypoints are used [#4909] https://github.com/Project-OSRM/osrm-backend/issues/4909
Additional port changes:
- Removed USE_LDCONFIG (no shared libs)
- Grouped USExx
- Silenced the pre-install command
PR: 226156
Submitted by: Andreas Andersson <a.andersson.thn@gmail.com> (maintainer)
Approved by: tcberner (mentor, implicit)