Add functions in sysinfo.h.

Bug: 17703902

Change-Id: I699d12d76a8fc483c919be730c2ac63641b71a1d
diff --git a/libc/Android.mk b/libc/Android.mk
index 345a1f3..7d438f4 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -213,6 +213,7 @@
     bionic/stubs.cpp \
     bionic/symlink.cpp \
     bionic/sysconf.cpp \
+    bionic/sysinfo.cpp \
     bionic/syslog.cpp \
     bionic/sys_siglist.c \
     bionic/sys_signame.c \