bump Lua references from 5.4.6 to 5.4.8

sys/msdos/Install.dos

@@ -42,7 +42,7 @@ II. There once was a time when people built NetHack right on their DOS machine.
     a DOS-extender (for including in msdos packaging) from:
         http://sandmann.dotster.com/cwsdpmi/csdpmi7b.zip
     and Lua from:
-        http://www.lua.org/ftp/lua-5.4.6.tar.gz
+        http://www.lua.org/ftp/lua-5.4.8.tar.gz
 
     If you want the DOSVGA build, to support higher resolutions and Unicode
     symbols, you also need:
@@ -123,7 +123,7 @@ Appendix B - Common Difficulties Encountered
 
      For example:
          make CROSS_TO_MSDOS=1 package
-         ( cd src ; make LUA_VERSION=5.4.6 nethack )
+         ( cd src ; make LUA_VERSION=5.4.8 nethack )
          make[1]: Entering directory '/home/johndoe/NHsource/src'
          mkdir -p ../targets/msdos ; make ../targets/msdos/exceptn.o ;
          make[2]: Entering directory '/home/johndoe/NHsource/src'

sys/msdos/Makefile.GCC

@@ -56,7 +56,7 @@ endif
 # Location of LUA
 #
 # Original source needs to be obtained from: 
-#    http://www.lua.org/ftp/lua-5.4.6.tar.gz
+#    http://www.lua.org/ftp/lua-5.4.8.tar.gz
 #
 #    This build assumes that the LUA sources are located
 #    at the specified location. If they are actually elsewhere
@@ -324,7 +324,7 @@ ALLOBJ = $(VOBJ) $(SOBJ) $(TILOBJ) $(TILOBJ2) $(VVOBJ)
 
 #===============-=================================================
 # LUA library
-# Source from http://www.lua.org/ftp/lua-5.4.6.tar.gz
+# Source from http://www.lua.org/ftp/lua-5.4.8.tar.gz
 #=================================================================
 
 LUASRC   = $(LUATOP)/src

sys/msdos/fetch-cross-compiler.sh

@@ -15,7 +15,7 @@ if [ -z "$GCCVER" ]; then
 fi
 
 if [ -z "$LUA_VERSION" ]; then
-	export LUA_VERSION=5.4.6
+	export LUA_VERSION=5.4.8
 fi
 
 if [ ! -d "$(pwd)/lib" ]; then