[build] Expose rs-sub-ninja.sh in tool_paths.json

rs-sub-ninja.sh is a drop-in replacement for ninja
that includes rsproxy-wrap.sh for use with ResultStore.

This is intended for use in the 'build' recipe module
when invoking 'fint'.

Bug: 473907403
Change-Id: I64af27730a09917bdf4108639f3b50687af93638
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1483046
Reviewed-by: Oliver Newman <olivernewman@google.com>
Commit-Queue: David Fang <fangism@google.com>
1 file changed