[devel] Removed contrib/pngminim/*/gather.sh

Source file gathering is now done in the makefile.
diff --git a/CHANGES b/CHANGES
index 5ea67c1..fd1c293 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2700,6 +2700,7 @@
     easier to understand if an API they need is missing.
   Include png_reset_zstream() in png.c only when PNG_READ_SUPPORTED is defined.
   Removed dummy_inflate.c from contrib/pngminim/encoder
+  Removed contrib/pngminim/*/gather.sh; gathering is now done in the makefile.
 
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