Does not seem to work for 5.2

[korymath]

Seems to be causing problems with torch-twrl for 5.2

https://travis-ci.com/twitter/torch-twrl/jobs/53097080

works for luajit21 and lua51

ideas?

Function call failed
error loading module 'libhash' from file '/home/travis/torch/install/lib/lua/5.2/libhash.so':
/home/travis/torch/install/lib/lua/5.2/libhash.so: undefined symbol: luaL_register
stack traceback:
[C]: in ?
[C]: in function 'require'
/home/travis/torch/install/share/lua/5.2/hash/init.lua:1: in main chunk
[C]: in function 'require'
...ch/install/share/lua/5.2/twrl/agent/model/tilecoding.lua:4: in main chunk
[C]: in function 'require'
test/test.lua:21: in function <test/test.lua:17>
[C]: in function 'xpcall'
/home/travis/torch/install/share/lua/5.2/torch/Tester.lua:477: in function '_pcall'
/home/travis/torch/install/share/lua/5.2/torch/Tester.lua:436: in function '_run'
/home/travis/torch/install/share/lua/5.2/torch/Tester.lua:355: in function 'run'
test/test.lua:73: in main chunk
[C]: in ?