pw_toolchain: Use RSP file for linking
pw_toolchain: Use RSP file for linking

Moves libraries into .rsp files for link steps to allow projects to grow
past CLI limits.

Change-Id: I41bdf5cd8805bb3b0a9bc379b2609a50cf5fd15c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/62100
Pigweed-Auto-Submit: Armando Montanez <97ef6fdb231c129ac8827d9f0c4106bfbf57f74f@google.com>
Reviewed-by: Alexei Frolov <a1b001416a8cf9aaea32a3411f8f3c0793ebc0b5@google.com>
Commit-Queue: Auto-Submit <14637eda5603879df170705285bf30f5996692f0@pigweed.google.com.iam.gserviceaccount.com>

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed