[libpng16] Added "-D_CRT_SECURE_NO_WARNINGS" to CFLAGS in

scripts/makefile.vcwin32.
Removed the obsolete $ARCH variable from scripts/makefile.darwin.

ANNOUNCE

@@ -1,4 +1,4 @@
-Libpng 1.6.15rc02 - November 14, 2014
+Libpng 1.6.15rc03 - November 17, 2014
 
 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.
@@ -8,20 +8,20 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.6.15rc02.tar.xz (LZMA-compressed, recommended)
-   1.6.15rc02.tar.gz
+   1.6.15rc03.tar.xz (LZMA-compressed, recommended)
+   1.6.15rc03.tar.gz
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1615r02.7z  (LZMA-compressed, recommended)
-   lp1615r02.zip
+   lp1615r03.7z  (LZMA-compressed, recommended)
+   lp1615r03.zip
 
 Other information:
 
-   1.6.15rc02-README.txt
-   1.6.15rc02-LICENSE.txt
-   libpng-1.6.15rc02-*.asc (armored detached GPG signatures)
+   1.6.15rc03-README.txt
+   1.6.15rc03-LICENSE.txt
+   libpng-1.6.15rc03-*.asc (armored detached GPG signatures)
 
 Changes since the last public release (1.6.14):
 
@@ -84,6 +84,10 @@ Version 1.6.15rc02 [November 14, 2014]
     is different from POSIX make and other make programs.  Surround the
     macro definitions with ifndef guards (Cosmin).
 
+Version 1.6.15rc03 [November 16, 2014]
+  Added "-D_CRT_SECURE_NO_WARNINGS" to CFLAGS in scripts/makefile.vcwin32.
+  Removed the obsolete $ARCH variable from scripts/makefile.darwin.
+
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