send-pack.c: move async's #ifdef NO_PTHREADS back to run-command.c

send-pack.c: move async's #ifdef NO_PTHREADS back to run-command.c

On systems that do not support multithread, start_async() is
implemented with fork(). This implementation details unfortunately
leak out at least in send-pack.c [1].

To keep the code base clean of NO_PTHREADS, move the this #ifdef back
to run-command.c. The new wrapper function async_with_fork() at least
helps suggest that this special "close()" is related to async in fork
mode.

[1] 09c9957cf7 (send-pack: avoid deadlock when pack-object dies early
    - 2011-04-25)

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>