implement posix_madvise

Bug: 18472477
Change-Id: I8183de6c281acf69ed5f7f88351b056b9827b162
diff --git a/libc/Android.mk b/libc/Android.mk
index 2270dc6..f04cf5c 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -153,6 +153,7 @@
     bionic/poll.cpp \
     bionic/posix_fadvise.cpp \
     bionic/posix_fallocate.cpp \
+    bionic/posix_madvise.cpp \
     bionic/posix_timers.cpp \
     bionic/pthread_atfork.cpp \
     bionic/pthread_attr.cpp \