tips from Hisham
luajit: refactor without dont-strip.patch

the variable TARGET_STRIP does the job
luajit: refactor without shared-lib.patch

the variable BUILDMODE does the job
lua: choice between 5.1.x & 5.2.x
lua: add official patches

from http://www.lua.org/bugs.html
lua-modules: choice between Lua 5.1.x & Lua 5.2.x