Add missing sysinfo() implementation (already declared in <sys/sysinfo.h>) - DO NOT MERGE

Change-Id: Iac4eb5911ffe4a7ab72b84df44e907685ac816af
diff --git a/libc/docs/CHANGES.TXT b/libc/docs/CHANGES.TXT
index ce43f1e..256607c 100644
--- a/libc/docs/CHANGES.TXT
+++ b/libc/docs/CHANGES.TXT
@@ -8,6 +8,9 @@
 - <semaphore.h>: Use private futexes for semaphore implementation,
   unless your set 'pshared' to non-0 when calling sem_init().
 
+- <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: