Allow redirecting logging to an FD

This change allows redirection of logging facilities, from syslog to a
file.

Bug: None
Test: make tests  // see logging in stderr
Change-Id: Ia45ccb87908f1d4a2f7964a01d11a74da6e9fdb7
diff --git a/libminijail.c b/libminijail.c
index d06aeeb..0eca595 100644
--- a/libminijail.c
+++ b/libminijail.c
@@ -2691,3 +2691,8 @@
 		free(j->cgroups[i]);
 	free(j);
 }
+
+void API minijail_log_to_fd(int fd, int min_priority)
+{
+	init_logging(LOG_TO_FD, fd, min_priority);
+}