Remove stray include.

I left an unneccessary include, so removing.

Bug: 15455302

(cherry picked from commit 3675f37afff607da4dd4026cab6d529291ea08da)

Change-Id: I2a1e94a881ce7250812bec6596ac112b6ac53eda
diff --git a/android/src/je_mallinfo.c b/android/src/je_mallinfo.c
index e53e5ff..56001af 100644
--- a/android/src/je_mallinfo.c
+++ b/android/src/je_mallinfo.c
@@ -20,8 +20,6 @@
 extern malloc_mutex_t arenas_lock;
 extern arena_t **arenas;
 
-#include <unistd.h>
-
 // This is an implementation that uses the same arena access pattern found
 // in the arena_stats_merge function from src/arena.c.
 struct mallinfo je_mallinfo() {