Add changelog for !49

CHANGELOG.md

@@ -8,6 +8,10 @@ We're using semantic versioning and the following changelog types:
 
 If a change only affects particular applications, they are listed in parentheses after the type, e.g. feat(unl0kr).
 
+## Unreleased
+
+- misc: Use standard C library instead of builtin functions (!49, thanks @vstoiakin)
+
 ## 3.3.0 (2025-04-15)
 
 - feat: Add a systemd password agent (!33, thanks @vstoiakin)