[NaCl SDK] docs: Remove references to obsolete debugging env vars.

native_client_sdk/src/doc/devguide/devcycle/dynamic-loading.rst

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 Dynamic Linking and Loading with glibc
 ######################################
 
 .. contents::
   :local:
   :backlinks: none
   :depth: 2
 
 Introduction
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 As an alternative to using ``create_nmf``, it is possible to manually calculate
 the list of shared library dependencies using tools such as ``objdump_``.
 
 Deploying a dynamically linked application
 ==========================================
 
 As described above, an application's manifest file must explicitly list all the
 executable code modules that the application directly depends on, including
 modules from the application itself (.nexe and .so files), modules from the
 Native Client SDK (e.g., libppapi_cpp.so), and perhaps also modules from
-`naclport <naclports_>`_ or from `middleware systems <../../community/middleware>`_ that
+`naclports <http://code.google.com/p/naclports/>`_ or from
+`middleware systems <../../community/middleware>`_ that
 the application uses. You must provide all of those modules as part of the
 application deployment process.
 
 As explained in :doc:`Distributing Your Application
 <../distributing>`, there are two basic ways to deploy an application:
 
 * **hosted application:** all modules are hosted together on a web server of
   your choice
 
 * **packaged application:** all modules are packaged into one file, hosted in
@@ skipping 102 matching lines @@
 **undefined reference to 'dlopen' collect2: ld returned 1 exit status**
   This is a linker ordering problem that usually results from improper ordering
   of command line flags when linking. Reconfigure your command line string to
   list libraries after the -o flag.
 
 .. |menu-icon| image:: /images/menu-icon.png
 .. _objdump: http://en.wikipedia.org/wiki/Objdump
 .. _GLIBC: http://www.gnu.org/software/libc/index.html
 .. _POSIX: http://en.wikipedia.org/wiki/POSIX
 .. _newlib: http://sourceware.org/newlib/