[libpng15] Conditionalize install rules for MINGW and CYGWIN in CMakeLists.txt

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.5.8beta01 - January 15, 2012
+Libpng 1.5.8rc02 - January 25, 2012
 
 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.
@@ -9,24 +9,24 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.5.8beta01.tar.xz (LZMA-compressed, recommended)
-   1.5.8beta01.tar.gz
-   1.5.8beta01.tar.bz2
+   1.5.8rc02.tar.xz (LZMA-compressed, recommended)
+   1.5.8rc02.tar.gz
+   1.5.8rc02.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp158b01.7z  (LZMA-compressed, recommended)
-   lp158b01.zip
+   lp158r02.7z  (LZMA-compressed, recommended)
+   lp158r02.zip
 
 Other information:
 
-   1.5.8beta01-README.txt
-   1.5.8beta01-LICENSE.txt
+   1.5.8rc02-README.txt
+   1.5.8rc02-LICENSE.txt
 
 Changes since the last public release (1.5.7):
 
-Version 1.5.8beta01 [January 15, 2012]
+Version 1.5.8beta01 [January 15, 2011]
   Removed '#include config.h"' from contrib/libtests/pngvalid.c.  It's not
     needed and causes trouble for VPATH building.
   Moved AC_MSG_CHECKING([if libraries can be versioned]) later to the proper
@@ -34,6 +34,13 @@ Version 1.5.8beta01 [January 15, 2012]
   Fix bug in pngerror.c: some long warnings were being improperly truncated
     (bug introduced in libpng-1.5.3beta05).
 
+Version 1.5.8rc01 [January 25, 2012]
+  No changes.
+
+Version 1.5.8rc02
+  Fixed Min/GW uninstall to remove libpng.dll.a
+  Conditionalize the install rules for MINGW and CYGWIN in CMakeLists.txt
+
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