[libc] fix up the use of angle includes in include/ (#86027)

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