lua: Correctly build in compatibility layers

The environment variables for the Lua compatibility was changed in
Lua 5.3, and overlooked in the Linux From Scratch book when updating the
Lua version [1], probably using the recipe for Lua 5.2.

>  MYCFLAGS="-DLUA_COMPAT_5_2 -DLUA_COMPAT_5_1": This environment
>  variable includes compatibility layers with Lua 5.1 and 5.2 in the
>  build.

Fix this, so that the VLC media player, depending an Lua 5.1, builds and
works correctly.

[1] http://www.linuxfromscratch.org/blfs/view/7.10/general/lua.html

lua.be0

@@ -27,7 +27,7 @@ mee_configure() {
 mee_build() {
     sed -i '/#define LUA_ROOT/s:/usr/local/:/usr/:' src/luaconf.h
 
-    bee_build linux "MYCFLAGS=-fPIC -DLUA_COMPAT_ALL"
+    bee_build linux "MYCFLAGS=-fPIC -DLUA_COMPAT_5_2 -DLUA_COMPAT_5_1"
     cat >lua.pc <<-EOF
 	V=${PKGVERSION[2]}
 	R=${PKGVERSION}