Adds dependency on cl

[arcanis]

In my case, this update was required to make golden-ratio work (maybe because I wasn't using el-get).

[dsevilla]

@arcanis, you're right about first and second. They're aliases, so only needed when compiling, hence the eval-when-compile.

[arcanis]

Here is the eval-when-compile : )

[roman]

Thanks!