patch to use Lua 5.2 instead of Lua 5.1.

Need testing before contribution to upstream.

XXX file upstream bug

--- libpeas-1.14.0/loaders/lua5.2/resources/peas-lua-compile.lua	2015-06-25 23:41:37.616161175 -0700
+++ libpeas-1.14.0/loaders/lua5.2/resources/peas-lua-compile.lua	2015-06-25 23:41:18.975741723 -0700
@@ -38,8 +38,8 @@
         check(err, 'Failed to open file "%s"', filename)
 
          -- Error includes the filename
-        local compiled, err = loadstring(input_file:read('*a'),
-                                         '@' .. filename)
+        local compiled, err = load(input_file:read('*a'),
+                                   '@' .. filename)
         check(err, 'Invalid Lua file')
 
         local f, err = io.open(output, 'wb')