Make bin/aphlict behave slightly better when forking

Summary:
Due to how file descriptors get inherited when a process forks and the way
our script to start/restart stuff works, having bin/aphlict not close
STDOUT caused our script to hang. This diff provides a solution; however,
something like https://secure.phabricator.com/diffusion/PHU/browse/master/src/daemon/PhutilDaemonOverseer.php;b45eea975f6d9afc$127-129
may be better or more robust.

Test Plan:
Run our script that calls bin/aphlict in passthru() and see that it no
longer hangs.

Reviewers: epriestley, vrana

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4240

Author: Nick Harper

support/aphlict/server/aphlict_launcher.php

@@ -89,6 +89,13 @@
   } else if ($pid) {
     exit(0);
   }
+  // When we fork, the child process will inherit its parent's set of open
+  // file descriptors. If the parent process of bin/aphlict is waiting for
+  // bin/aphlict's file descriptors to close, it will be stuck waiting on
+  // the daemonized process. (This happens if e.g. bin/aphlict is started
+  // in another script using passthru().)
+  fclose(STDOUT);
+  fclose(STDERR);
 }