add cmake versioning for libluaT.so
Fowrad: merged upstream. https://github.com/torch/torch7/pull/733
--- a/lib/luaT/CMakeLists.txt
+++ b/lib/luaT/CMakeLists.txt
@@ -13,6 +13,10 @@
   ADD_LIBRARY(luaT_static STATIC luaT.h luaT.c)
 endif()
 
+SET_TARGET_PROPERTIES(luaT PROPERTIES
+  VERSION   0
+  SOVERSION 0)
+
 IF(APPLE)
   SET_TARGET_PROPERTIES(luaT PROPERTIES
     LINK_FLAGS "-undefined dynamic_lookup")
