[libpng15] Bump version to 1.5.15beta06

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.5.15beta05 - February 18, 2013
+Libpng 1.5.15beta06 - February 18, 2013
 
 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
 
-   1.5.15beta05.tar.xz (LZMA-compressed, recommended)
-   1.5.15beta05.tar.gz
-   1.5.15beta05.tar.bz2
+   1.5.15beta06.tar.xz (LZMA-compressed, recommended)
+   1.5.15beta06.tar.gz
+   1.5.15beta06.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1515b05.7z  (LZMA-compressed, recommended)
-   lp1515b05.zip
+   lp1515b06.7z  (LZMA-compressed, recommended)
+   lp1515b06.zip
 
 Other information:
 
-   1.5.15beta05-README.txt
-   1.5.15beta05-LICENSE.txt
+   1.5.15beta06-README.txt
+   1.5.15beta06-LICENSE.txt
 
 Changes since the last public release (1.5.14):
 
@@ -49,7 +49,7 @@ Version 1.5.15beta04 [February 15, 2013]
   Enclosed the new png_get_palette_max in #ifdef PNG_GET_PALETTE_MAX_SUPPORTED
     block, and revised pnglibconf.h and pnglibconf.h.prebuilt accordingly.
 
-Version 1.5.15beta05 [February 18, 2013]
+Version 1.5.15beta05 [February 17, 2013]
   Use approved/supported Android method to check for NEON, use Linux/POSIX
     1003.1 API to check /proc/self/auxv avoiding buffer allocation and other
     library calls.
@@ -57,6 +57,8 @@ Version 1.5.15beta05 [February 18, 2013]
     while building with a parallel make.
   Use parentheses more consistently in "#if define(MACRO)" tests.
 
+Version 1.5.15beta06 [February 18, 2013]
+
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