[libpng16] Revised pngvalid.c to support libpng 1.5, which does not support the

PNG_MAXIMUM_INFLATE_WINDOW option, so #define it out when appropriate in
pngvalid.c
diff --git a/ANNOUNCE b/ANNOUNCE
index 3931046..b79b076 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -51,6 +51,9 @@
   Merged pngrio.c, pngtrans.c, pngwio.c, and pngerror.c with libpng-1.7.0
   Merged libpng-1.7.0 changes to make no-interlace configurations work
     with test programs.
+  Revised pngvalid.c to support libpng 1.5, which does not support the
+    PNG_MAXIMUM_INFLATE_WINDOW option, so #define it out when appropriate in
+    pngvalid.c
 
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diff --git a/CHANGES b/CHANGES
index 2e2e037..7abfab1 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4776,6 +4776,9 @@
   Merged pngrio.c, pngtrans.c, pngwio.c, and pngerror.c with libpng-1.7.0
   Merged libpng-1.7.0 changes to make no-interlace configurations work
     with test programs.
+  Revised pngvalid.c to support libpng 1.5, which does not support the
+    PNG_MAXIMUM_INFLATE_WINDOW option, so #define it out when appropriate in
+    pngvalid.c
 
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 (subscription required; visit
diff --git a/contrib/libtests/pngvalid.c b/contrib/libtests/pngvalid.c
index c20427d..c4a4a26 100644
--- a/contrib/libtests/pngvalid.c
+++ b/contrib/libtests/pngvalid.c
@@ -10361,10 +10361,12 @@
 
          else
 #endif
+#ifdef PNG_MAXIMUM_INFLATE_WINDOW
          if (strncmp(arg, "max-inflate-window:", 19) == 0)
             option = PNG_MAXIMUM_INFLATE_WINDOW, arg += 19;
 
          else
+#endif
          {
             fprintf(stderr, "pngvalid: %s: %s: unknown option\n", *argv, arg);
             exit(99);