Added changelog entries for build updates

Author: zayenz

changelog.in

@@ -65,10 +65,46 @@
 
 [RELEASE]
 Version: 6.3.0
-Date: 2020-??-??
+Date: 2026-??-??
 [DESCRIPTION]
 Let's see.
 
+[ENTRY]
+Module: other
+What:   change
+Rank:   major
+[DESCRIPTION]
+Modernize the build infrastructure across CMake and autoconf:
+raise CMake minimum version to 3.21, update autoconf macros to
+current style, make configure.ac the canonical autoconf source,
+and centralize shared version metadata in gecode-version.m4.
+
+[ENTRY]
+Module: other
+What:   change
+Rank:   major
+[DESCRIPTION]
+Migrate build helper scripts from Perl to Python and execute them
+via uv. This removes Perl as a build-time dependency and unifies
+script execution in autoconf, CMake, and CI.
+
+[ENTRY]
+Module: search
+What:   bug
+Rank:   minor
+[DESCRIPTION]
+Fix CPProfiler compilation on Windows and MinGW by using the
+standard _WIN32 platform guard, guarding MSVC-specific pragmas,
+and linking against the Windows socket library where required.
+
+[ENTRY]
+Module: other
+What:   removed
+Rank:   major
+[DESCRIPTION]
+Remove outdated contrib modules (qecode and quacode) from the
+main build and repository maintenance path.
+
 [ENTRY]
 Module: flatzinc
 What:   change
@@ -179,7 +215,7 @@ What:   new
 Rank:   minor
 Thanks: Jip J. Dekker
 [DESCRIPTION]
-Add the reason for restarting to the MetaInfo object available when restarting. 
+Add the reason for restarting to the MetaInfo object available when restarting.
 
 [ENTRY]
 Module: other
@@ -248,15 +284,15 @@ Thanks: Jip J. Dekker
 Add support for building Gecode Gist with Qt6.
 
 [ENTRY]
-Module: flatzinc 
+Module: flatzinc
 What:   new
 Rank:   minor
 Thanks: Jip J. Dekker
 [DESCRIPTION]
 Add support for disjunctive and cumulative on optional variables.
 
 [ENTRY]
-Module: flatzinc 
+Module: flatzinc
 What:   new
 Rank:   minor
 Thanks: Jip J. Dekker