Add missing includes.

Test: mma
Bug: None
Change-Id: I0221b213e08d07cc5ac0b704a86e98ae8c0f456f
diff --git a/libc/tzcode/bionic.cpp b/libc/tzcode/bionic.cpp
index b486174..9b59183 100644
--- a/libc/tzcode/bionic.cpp
+++ b/libc/tzcode/bionic.cpp
@@ -27,6 +27,7 @@
  */
 
 #include <arpa/inet.h> // For ntohl(3).
+#include <errno.h>
 #include <fcntl.h>
 #include <stdint.h>
 #include <stdlib.h>