Performed en-masse via:

    $ grep -rn "#include <ll" libc/include -l | \
      xargs perl -pi -e 's/#include <ll(.*)>/#include "ll$1"/'
    $ grep -rn "#include <__" libc/include -l | \
      xargs perl -pi -e 's/#include <__(.*)>/#include "__$1"/'

Link: #83463
Link: #83210

Summary:
There are a lot of random training spaces on various lines. This patch
just got rid of all of them with `sed 's/\ \+$//g'.

Namely, posix_spawn_file_actions_addclose,
posix_spawn_file_actions_adddup2, posix_spawn_file_actions_addopen,
posix_spawn_file_actions_destroy, posix_spawn_file_actions_init have
been added.

Reviewed By: michaelrj, lntue

Differential Revision: https://reviews.llvm.org/D135603