Add missing sysinfo() implementation (already declared in <sys/sysinfo.h>)

Change-Id: Ie9168238c3a8e77daab4f39939756d4c53d8af37
diff --git a/libc/docs/CHANGES.TXT b/libc/docs/CHANGES.TXT
index 96da044..0599788 100644
--- a/libc/docs/CHANGES.TXT
+++ b/libc/docs/CHANGES.TXT
@@ -7,6 +7,9 @@
 
 - <math.h>: Added sincos() and sincosf() (GLibc compatibility).
 
+- <sys/sysinfo.h>: Added missing sysinfo() system call implementation
+  (the function was already declared in the header though).
+
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 Differences between Android 2.2. and Android 2.1: