[devel] Bump version to libpng-1.4.0beta81
diff --git a/pngtest.c b/pngtest.c
index 4673c6c..2ed3125 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1619,4 +1619,4 @@
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_4_0beta80 your_png_h_is_not_version_1_4_0beta80;
+typedef version_1_4_0beta81 your_png_h_is_not_version_1_4_0beta81;