[master] Added the "vstudio" project to replace "visualc6" and "visualc71"

which will be removed from libpng-1.5.0.

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.4.2rc03 - April 24, 2010
+Libpng 1.4.2rc04 - April 26, 2010
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -9,20 +9,20 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.4.2rc03.tar.xz (LZMA-compressed, recommended)
-   1.4.2rc03.tar.gz
-   1.4.2rc03.tar.bz2
+   1.4.2rc04.tar.xz (LZMA-compressed, recommended)
+   1.4.2rc04.tar.gz
+   1.4.2rc04.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp142r03.zip
-   lp142r03.7z
+   lp142r04.zip
+   lp142r04.7z
 
 Other information:
 
-   1.4.2rc03-README.txt
-   1.4.2rc03-LICENSE.txt
+   1.4.2rc04-README.txt
+   1.4.2rc04-LICENSE.txt
 
 Changes since the last public release (1.4.1):
 
@@ -33,7 +33,7 @@ version 1.4.2beta01 [April 1, 2010]
 version 1.4.2rc01 [April 10, 2010]
   No changes.
 
-version 1.4.2rc02 [April 24, 2010]
+version 1.4.2rc02 [April 16, 2010]
   Documented the fact that png_set_dither() was disabled since libpng-1.4.0.
   Reenabled png_set_dither() but renamed it to png_set_quantize() to reflect
     more accurately what it actually does.  At the same time, renamed
@@ -44,6 +44,10 @@ version 1.4.2rc03 [April 24, 2010]
   Added some "(long)" typecasts to printf calls in png_handle_cHRM().
   Relaxed the overly-restrictive permissions of some files.
 
+version 1.4.2rc04 [April 26, 2010]
+  Added the "vstudio" project to replace "visualc6" and "visualc71" which
+    will be removed from libpng-1.5.0.
+
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