Added blurb to CHANGES.txt, RELEASE.txt and updated CheckFunc() in manpage

Author: bdbaddog

CHANGES.txt

@@ -9,9 +9,10 @@ NOTE: 4.3.0 now requires Python 3.6.0 and above. Python 3.5.x is no longer suppo
 
 RELEASE  VERSION/DATE TO BE FILLED IN LATER
 
-      From John Doe:
-
-        - Whatever John Doe did.
+  From Joseph Brill:
+    - Add an optional argument list string to configures CheckFunc method so
+      that the generated function argument list matches the function's
+      prototype when including a header file. Fixes GH Issue #4320
 
 
 RELEASE 4.6.0 -  Sun, 19 Nov 2023 17:22:20 -0700

RELEASE.txt

@@ -26,8 +26,9 @@ DEPRECATED FUNCTIONALITY
 CHANGED/ENHANCED EXISTING FUNCTIONALITY
 ---------------------------------------
 
-- List modifications to existing features, where the previous behavior
-  wouldn't actually be considered a bug
+- Add an optional argument list string to configures CheckFunc method so
+  that the generated function argument list matches the function's
+  prototype when including a header file. Fixes GH Issue #4320
 
 FIXES
 -----

doc/man/scons.xml

@@ -3954,7 +3954,7 @@ Returns a boolean indicating success or failure.</para>
   </varlistentry>
 
   <varlistentry>
-  <term><replaceable>context</replaceable>.<methodname>CheckFunc</methodname>(<parameter>function_name, [header, language]</parameter>)</term>
+  <term><replaceable>context</replaceable>.<methodname>CheckFunc</methodname>(<parameter>function_name, [header, language, funcargs]</parameter>)</term>
   <listitem>
 <para>Checks if <parameter>function_name</parameter> is usable
 in the context's local environment, using the compiler
@@ -3974,6 +3974,11 @@ If omitted, the default stanza will be
 (with <parameter>function_name</parameter> appropriately substituted):
 </para>
 
+    <para>
+      The optional <parameter>funcargs</parameter> can be defined to specify an argument list for the generated
+      function invocation.
+    </para>
+
 <programlisting language="C">
 #ifdef __cplusplus
 extern "C"