Fix "error: 'strerror' was not declared in this scope".

Change-Id: If8e3b1d1198df2e725ba08fdecda6bb996e23656

mobicore/common/LogWrapper/log.h

diff --git a/mobicore/common/LogWrapper/log.h b/mobicore/common/LogWrapper/log.h
index 2ffc0b2..041793c 100644
--- a/mobicore/common/LogWrapper/log.h
+++ b/mobicore/common/LogWrapper/log.h
@@ -36,6 +36,7 @@
 
 #include <unistd.h>
 #include <stdio.h>
+#include <string.h>
 #include <android/log.h>
 
 /** LOG_I(fmt, args...)