[libpng16] Check for __has_extension before using it in pngconf.h, to
support older Clang versions (Jeremy Sequoia).
diff --git a/CHANGES b/CHANGES
index 3d1fa89..1a1b68a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4829,7 +4829,7 @@
and it adds corresponding code to pngimage.c to handle such options
by not attempting to test them.
-Version 1.6.10beta02 [February 17, 2014]
+Version 1.6.10beta02 [February 20, 2014]
Moved redefines of png_error(), png_warning(), png_chunk_error(),
and png_chunk_warning() from pngpriv.h to png.h to make them visible
to libpng-calling applications.
@@ -4844,6 +4844,8 @@
run all the png_handle_*() and depend on them to return if info_ptr == NULL.
This improves the performance of png_read_end(png_ptr, NULL) and makes
it more robust against future programming errors.
+ Check for __has_extension before using it in pngconf.h, to
+ support older Clang versions (Jeremy Sequoia).
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