[gdk-pixbuf] Add note on libpng for Visual Studio Builds

[Chun-wei Fan <fanchunwei src gnome org>]

commit 7fe457f0245d2b01332fd28caf4c8c6f05f6f627
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Jun 17 15:23:09 2013 +0800

    Add note on libpng for Visual Studio Builds
    
    Tell people that the Visual Studio project files will normally link to
    the latest stable release series of libpng that is supported by the
    codebase, and people can still use libpng 1.0.x-1.6.x if they choose
    to do so by changing some settings during the build.

 build/win32/vs10/README.txt |    7 +++++++
 build/win32/vs9/README.txt  |    7 +++++++
 2 files changed, 14 insertions(+), 0 deletions(-)
---
diff --git a/build/win32/vs10/README.txt b/build/win32/vs10/README.txt
index 17b746e..3d096f8 100644
--- a/build/win32/vs10/README.txt
+++ b/build/win32/vs10/README.txt
@@ -35,6 +35,13 @@ ZLib and LibPNG at the minimum.  Note that if you intend to build GDK-Pixbuf
 that does not use GDI+, you will also need the IJG JPEG libraries, libTIFF and
 libjasper (for JPEG-2000 operations).
 
+Please note that the Visual Studio project files will typically link to the
+latest stable release of LibPNG which the GDK-Pixbuf codebase supports by
+default.  If you intend to use and link to an older version of LibPNG, you
+may change the "Additional Dependencies" setting accordingly (such as changing
+from libpng16.lib to libpng14.lib) for the GDK-Pixbuf project.  The minimum
+supported release series for LibPNG is 1.0.x at this time of writing.
+
 For the Dependencies, you may either:
 
 a) look for all of the dependencies (except GLib*, libjasper) under
diff --git a/build/win32/vs9/README.txt b/build/win32/vs9/README.txt
index b3460e8..51214aa 100644
--- a/build/win32/vs9/README.txt
+++ b/build/win32/vs9/README.txt
@@ -35,6 +35,13 @@ ZLib and LibPNG at the minimum.  Note that if you intend to build GDK-Pixbuf
 that does not use GDI+, you will also need the IJG JPEG libraries, libTIFF and
 libjasper (for JPEG-2000 operations).
 
+Please note that the Visual Studio project files will typically link to the
+latest stable release of LibPNG which the GDK-Pixbuf codebase supports by
+default.  If you intend to use and link to an older version of LibPNG, you
+may change the "Additional Dependencies" setting accordingly (such as changing
+from libpng16.lib to libpng14.lib) for the GDK-Pixbuf project.  The minimum
+supported release series for LibPNG is 1.0.x at this time of writing.
+
 For the Dependencies, you may either:
 
 a) look for all of the dependencies (except GLib*, libjasper) under