[devel] Made PNG_READ_16_TO_8_ACCURATE_SCALE configurable again.

If this is not enabled, png_set_strip_16() and png_do_scale_16_to_8()
aren't built.

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.5.4beta04 - June 15, 2011
+Libpng 1.5.4beta04 - June 16, 2011
 
 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.
@@ -200,12 +200,12 @@ Version 1.5.4beta02 [June 14, 2011]
   Removed the ACCURATE and LEGACY options (they are no longer useable)
   Use the old scaling method for background if png_set_chop_16() was
     called.
-  Made png_set_chop_16() API removeable by disabling PNG_CHOP_16_TO_8_SUPPORTED
+  Made png_set_chop_16() API removeable with PNG_NO_READ_CHOP_16_TO_8_SUPPORTED
 
 Version 1.5.4beta03 [June 15, 2011]
   Fixed a problem in png_do_expand_palette() exposed by optimization in
     1.5.3beta06
-  Also removed a spurious (totally unused and confusing) member from png_info.
+  Also removed a spurious and confusing "trans" member ("trans") from png_info.
   The palette expand optimization prevented expansion to an intermediate RGBA
     form if tRNS was present but alpha was marked to be stripped; this exposed
     a check for tRNS in png_do_expand_palette() which is inconsistent with the
@@ -213,9 +213,11 @@ Version 1.5.4beta03 [June 15, 2011]
   Correction to the expand_16 code; removed extra instance of
     png_set_scale_16_to_8 from pngpriv.h
 
-Version 1.5.4beta04 [June 15, 2011]
+Version 1.5.4beta04 [June 16, 2011]
   Added a missing "#ifdef PNG_READ_BACKGROUND_SUPPORTED/#endif" in pngrtran.c
   Added PNG_TRANSFORM_CHOP_16 to the high-level read transforms.
+  Made PNG_READ_16_TO_8_ACCURATE_SCALE configurable again.  If this is
+    not enabled, png_set_strip_16() and png_do_scale_16_to_8 aren't built.
 
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