Add <sys/statvfs.h>.

Bug: 2512019
Change-Id: I6e7fd3fa281977cc4bc270481a95416b5b2dc351
diff --git a/tests/Android.mk b/tests/Android.mk
index 34aaec9..efee17b 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -74,6 +74,7 @@
     signal_test.cpp \
     stack_protector_test.cpp \
     stack_unwinding_test.cpp \
+    statvfs_test.cpp \
     stdio_test.cpp \
     stdlib_test.cpp \
     string_test.cpp \