5fac5f6edb
Submodule local/sources/relibc updated to 90168f56, which converts
two panic-site unimplemented!() calls in the dynamic linker
(ld_so/dso.rs static_relocate and lazy_relocate) into proper
Err() returns. Executables using unfamiliar relocation types
now fail gracefully at dlopen time instead of aborting the
process.
See submodule commit message for full rationale.