Add getloadavg(3).

Lets us build ninja with bionic.

Bug: N/A
Test: ran tests
Change-Id: I97eef1247d794b58a2b9aee4851551632e5a4e48
diff --git a/libc/Android.bp b/libc/Android.bp
index 1fc3062..681394f 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -1314,6 +1314,7 @@
         "bionic/getdomainname.cpp",
         "bionic/getentropy.cpp",
         "bionic/gethostname.cpp",
+        "bionic/getloadavg.cpp",
         "bionic/getpagesize.cpp",
         "bionic/getpgrp.cpp",
         "bionic/getpid.cpp",