Fix build on Debian unstable
process_pt_dynamic: Add missing 'break' to DT_JMPREL case
Without this, we fall through to the case for DT_BIND_NOW, which will log a misleading debug message before breaking out of the switch.
Thanks, gcc 8!
safe_strncpy: Work around -Werror=stringop-truncation
Ideally we should bubble up errors to the caller rather than silently truncating, but if we have to truncate, let's at least be sufficiently explicit about it that gcc 8 doesn't sulk.