Instrumented libraries: improve parallel build

This CL:
* Adds a --parallel option to build_and_package.py to build
  the 4 instrumented library configs concurrently.
* Removes parallel make.  Some libraries don't support parallel builds.
  Additionally, there were many overrides to set the number of jobs to
  1, and the only library that actually used parallel builds was
  libcap.
* Changes the -j argument to be the number of ninja jobs to use.
* Suppresses error output from nss.

NOTRY=true
BUG=None
R=eugenis@chromium.org

Review-Url: https://codereview.chromium.org/2735013004
Cr-Original-Commit-Position: refs/heads/master@{#455307}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: a30808fd6d7f2e20278b303a2db92dc43076c974
4 files changed