support for build with current Lua version 5.4.4

On some platforms this may require:
       re-using a sys/unix/hints file to generate updated Makefiles
       make spotless
       make fetch-lua

sys/msdos/fetch-cross-compiler.sh

@@ -12,7 +12,7 @@ if [ -z "$GCCVER" ]; then
 fi
 
 if [ -z "$LUA_VERSION" ]; then
-	export LUA_VERSION=5.4.3
+	export LUA_VERSION=5.4.4
 fi
 
 if [ ! -d "$(pwd)/lib" ]; then