support for build with current Lua version 5.4.3

On some platforms this may require:
	make spotless
	make fetch-lua

I did attempt to force a reminder message about the latter to
Makefile.top this time, and hope that works correctly for everyone.

sys/msdos/Makefile.GCC

@@ -42,13 +42,13 @@ PDCURSES_TOP=../../pdcurses
 ifeq "$(LUA_VERSION)" "5.3.5"
 LUAVER=5.3.5
 else
-LUAVER=5.4.2
+LUAVER=5.4.3
 endif
 #---------------------------------------------------------------
 # Location of LUA
 #
 # Original source needs to be obtained from: 
-#    http://www.lua.org/ftp/lua-5.4.2.tar.gz
+#    http://www.lua.org/ftp/lua-5.4.3.tar.gz
 #
 #    This build assumes that the LUA sources are located
 #    at the specified location. If they are actually elsewhere
@@ -305,7 +305,7 @@ ALLOBJ = $(VOBJ) $(SOBJ) $(TILOBJ) $(TILOBJ2) $(VVOBJ)
 
 #===============-=================================================
 # LUA library
-# Source from http://www.lua.org/ftp/lua-5.4.2.tar.gz
+# Source from http://www.lua.org/ftp/lua-5.4.3.tar.gz
 #=================================================================
 
 LUASRC   = $(LUATOP)/src

sys/msdos/fetch-cross-compiler.sh

@@ -12,7 +12,7 @@ if [ -z "$GCCVER" ]; then
 fi
 
 if [ -z "$LUA_VERSION" ]; then
-	export LUA_VERSION=5.4.2
+	export LUA_VERSION=5.4.3
 fi
 
 if [ ! -d "$(pwd)/lib" ]; then