[devel] Relocated various UNKNOWN_CHUNK macros

outside of the PNG_READ|WRITE_ANCILLARY_CHUNK_SUPPORTED blocks, where
they did not really belong.  Updated CHANGES and ANNOUNCE.

ANNOUNCE

@@ -473,7 +473,7 @@ version 1.4.0beta62 [June 2, 2009]
   Added a section to the libpng documentation about using png_get_io_ptr()
     in configure scripts to detect the presence of libpng.
 
-version 1.4.0beta63 [June 16, 2009]
+version 1.4.0beta63 [June 15, 2009]
   Revised libpng*.txt and libpng.3 to mention calling png_set_IHDR()
     multiple times and to specify the sample order in the tRNS chunk,
     because the ISO PNG specification has a typo in the tRNS table.
@@ -482,7 +482,11 @@ version 1.4.0beta63 [June 16, 2009]
     available for ignoring known chunks even when not saving unknown chunks.
   Adopted preference for consistent use of "#ifdef" and "#ifndef" versus
     "#if defined()" and "if !defined()" where possible.
+
+version 1.4.0beta64 [June 16, 2009]
   Eliminated PNG_LEGACY_SUPPORTED code.
+  Moved the various unknown chunk macro definitions outside of the
+     PNG_READ|WRITE_ANCILLARY_CHUNK_SUPPORTED blocks.
 
 version 1.4.0betaN [future]
   Build shared libraries with -lz and sometimes -lm.

CHANGES

@@ -2150,7 +2150,7 @@ version 1.4.0beta62 [June 2, 2009]
   Added a section to the libpng documentation about using png_get_io_ptr()
     in configure scripts to detect the presence of libpng.
 
-version 1.4.0beta63 [June 16, 2009]
+version 1.4.0beta63 [June 15, 2009]
   Revised libpng*.txt and libpng.3 to mention calling png_set_IHDR()
     multiple times and to specify the sample order in the tRNS chunk,
     because the ISO PNG specification has a typo in the tRNS table.
@@ -2160,8 +2160,10 @@ version 1.4.0beta63 [June 16, 2009]
   Adopted preference for consistent use of "#ifdef" and "#ifndef" versus
     "#if defined()" and "if !defined()" where possible.
 
-version 1.4.0beta63 [June 16, 2009]
+version 1.4.0beta64 [June 16, 2009]
   Eliminated PNG_LEGACY_SUPPORTED code.
+  Moved the various unknown chunk macro definitions outside of the
+     PNG_READ|WRITE_ANCILLARY_CHUNK_SUPPORTED blocks.
 
 version 1.4.0betaN [future]
   Build shared libraries with -lz and sometimes -lm.

pngconf.h

@@ -819,6 +819,17 @@
 #  define PNG_READ_zTXt_SUPPORTED
 #  define PNG_zTXt_SUPPORTED
 #endif
+#ifndef PNG_NO_READ_OPT_PLTE
+#  define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
+#endif                      /* optional PLTE chunk in RGB and RGBA images */
+#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
+    defined(PNG_READ_zTXt_SUPPORTED)
+#  define PNG_READ_TEXT_SUPPORTED
+#  define PNG_TEXT_SUPPORTED
+#endif
+
+#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
+
 #ifndef PNG_NO_READ_UNKNOWN_CHUNKS
 #  define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
 #  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
@@ -841,16 +852,6 @@
 #    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
 #  endif
 #endif
-#ifndef PNG_NO_READ_OPT_PLTE
-#  define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
-#endif                      /* optional PLTE chunk in RGB and RGBA images */
-#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
-    defined(PNG_READ_zTXt_SUPPORTED)
-#  define PNG_READ_TEXT_SUPPORTED
-#  define PNG_TEXT_SUPPORTED
-#endif
-
-#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
 
 #ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
 
@@ -963,6 +964,16 @@
 #    define PNG_zTXt_SUPPORTED
 #  endif
 #endif
+#if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
+    defined(PNG_WRITE_zTXt_SUPPORTED)
+#  define PNG_WRITE_TEXT_SUPPORTED
+#  ifndef PNG_TEXT_SUPPORTED
+#    define PNG_TEXT_SUPPORTED
+#  endif
+#endif
+
+#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
+
 #ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
 #  define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
 #  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
@@ -974,15 +985,6 @@
 #    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
 #  endif
 #endif
-#if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
-    defined(PNG_WRITE_zTXt_SUPPORTED)
-#  define PNG_WRITE_TEXT_SUPPORTED
-#  ifndef PNG_TEXT_SUPPORTED
-#    define PNG_TEXT_SUPPORTED
-#  endif
-#endif
-
-#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
 
 /* Turn this off to disable png_read_png() and
  * png_write_png() and leave the row_pointers member