linker: Support dlopen(NULL, ...) properly.

Change-Id: Icba37823cb350c34848cc466d144c3a0af87c94c
diff --git a/libc/docs/CHANGES.TXT b/libc/docs/CHANGES.TXT
index 96f25d3..d1d82de 100644
--- a/libc/docs/CHANGES.TXT
+++ b/libc/docs/CHANGES.TXT
@@ -70,6 +70,8 @@
 - <sys/vfs.h>: fixed implementation of fstatfs() (also fixes fpathconf()
   which uses it).
 
+- <dlfcn.h>: fixed dlopen() implementation to support dlopen(NULL, ...).
+  This allows one to look at the dynamic symbols exported by an executable.
 
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 Differences between Android 2.2. and Android 2.1: