Fix build issues after the merge

Change-Id: Ia856311187a0b2168cb859bd8b2300ff59df6569
diff --git a/libril/RilSapSocket.cpp b/libril/RilSapSocket.cpp
index 92cc98c..36277cf 100644
--- a/libril/RilSapSocket.cpp
+++ b/libril/RilSapSocket.cpp
@@ -24,6 +24,7 @@
 #define LOG_TAG "RIL_UIM_SOCKET"
 #include <utils/Log.h>
 #include <arpa/inet.h>
+#include <errno.h>
 
 RilSapSocket::RilSapSocketList *head;