Add <error.h>.

Bug: https://code.google.com/p/android/issues/detail?id=79170
Change-Id: Id91765fac45124545e2674a5b2c814707c1a448b
diff --git a/tests/Android.mk b/tests/Android.mk
index 87c330b..9304d46 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -57,6 +57,7 @@
     complex_test.cpp \
     ctype_test.cpp \
     dirent_test.cpp \
+    error_test.cpp \
     eventfd_test.cpp \
     fcntl_test.cpp \
     fenv_test.cpp \