Add comments to CHANGES.txt and RELEASE.txt

Author: SIEGRIST Anthony

CHANGES.txt

@@ -41,6 +41,10 @@ RELEASE  VERSION/DATE TO BE FILLED IN LATER
       Make doc function signature style more consistent - tweaks to AddOption,
       DefaultEnvironment and Tool,.
 
+  From Anthony Siegrist;
+    - On win32 platform, handle piped process output more robustly. Output encoding
+      fallback to UTF8 if it is defined at None by the output stream object.
+
 
 RELEASE 4.8.0 -  Sun, 07 Jul 2024 17:22:20 -0700
 

RELEASE.txt

@@ -47,6 +47,14 @@ FIXES
   `PackageVariable` and `PathVariable` are added to `__all__`,
   so this form of import should now work again.
 
+- On win32 platform, SCons 4.7.0 modified the determination
+  of the output encoding of piped processes. Instead of using the default
+  encoding, it relied on the encoding attribute of the output stream.
+  If the encoding attribute of the output stream was set to None,
+  it was triggering an invalid argument exeption. This was the case with
+  streams of type io.StringIO for example.
+  From now, if the encoding is set to None, UTF8 is used.
+
 IMPROVEMENTS
 ------------