lua: add version 5.1

The 5.1 build system doesn't seem to support building a shared object anymore?

pkgs/development/interpreters/lua-5/5.1.nix

@@ -0,0 +1,30 @@
+{ stdenv, fetchurl, readline}:
+
+stdenv.mkDerivation rec {
+  name = "lua-5.1.5";
+
+  src = fetchurl {
+    url = "http://www.lua.org/ftp/${name}.tar.gz";
+    sha256 = "2640fc56a795f29d28ef15e13c34a47e223960b0240e8cb0a82d9b0738695333";
+  };
+
+  buildInputs = [ readline ];
+
+  configurePhase = "makeFlagsArray=( INSTALL_TOP=$out INSTALL_MAN=$out/share/man/man1 PLAT=linux )";
+
+  meta = {
+    homepage = "http://www.lua.org";
+    description = "Lua is a powerful, fast, lightweight, embeddable scripting language.";
+    longDescription = ''
+      Lua combines simple procedural syntax with powerful data
+      description constructs based on associative arrays and extensible
+      semantics. Lua is dynamically typed, runs by interpreting bytecode
+      for a register-based virtual machine, and has automatic memory
+      management with incremental garbage collection, making it ideal
+      for configuration, scripting, and rapid prototyping.
+    '';
+    license = "MIT";
+    platforms = stdenv.lib.platforms.unix;
+    maintainers = [ ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -2716,10 +2716,9 @@ let
   love = callPackage ../development/interpreters/love {};
 
   lua4 = callPackage ../development/interpreters/lua-4 { };
-
   lua5 = callPackage ../development/interpreters/lua-5 { };
-
   lua5_0 = callPackage ../development/interpreters/lua-5/5.0.3.nix { };
+  lua5_1 = callPackage ../development/interpreters/lua-5/5.1.nix { };
 
   maude = callPackage ../development/interpreters/maude { };