[devel] Added exported png_longjmp() function.

CHANGES

diff --git a/CHANGES b/CHANGES
index 76501ca..480dc79 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2534,6 +2534,7 @@
   Changed #ifdef PNG_NO_STDIO_SUPPORTED to #ifdef PNG_NO_CONSOLE_IO_SUPPORTED
     wherever png_snprintf() is used to construct error and warning messages.
   Removed obsolete unused MMX-querying support from contrib/gregbook
+  Added exported png_longjmp() function.
 
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