Add <sys/statvfs.h>.

Bug: 2512019
Change-Id: I6e7fd3fa281977cc4bc270481a95416b5b2dc351
diff --git a/libc/Android.mk b/libc/Android.mk
index eba0a00..16b24de 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -225,6 +225,7 @@
     bionic/setlocale.cpp \
     bionic/signalfd.cpp \
     bionic/sigwait.cpp \
+    bionic/statvfs.cpp \
     bionic/__strcat_chk.cpp \
     bionic/__strchr_chk.cpp \
     bionic/__strcpy_chk.cpp \