Build broken on plain Ubuntu 14.04

[ooxi]

da80351 broke compilation on plain Ubuntu 14.04 since it ships CMake 2.8.12 while FindIntl is not available until CMake 3.2

This was not caught by Travis CI since they provide a CMake package. While Ubuntu 14.04 is still supported by Ubuntu, I most likely will drop support for violetland.

If you want to compile violetland on Ubuntu 14.04, you can simply revert da80351 :-)