Reland "Upgrade toybox to 1986075975db4cdab08133f8299ad72dd5af4b23".

This reverts commit c135e01052c08a73034572908209ef08c5025f26, but adds the now-necessary `-Wl,-dead_strip` to the Darwin linker flags.

Test: treehugger
Change-Id: Ie75d29692c4aaf51d84a2ba148d62cbc176c8610
26 files changed