Fix compilation with cmake

[zeule]

No description provided.

[codecov-io]

Current coverage is 59.58%

Merging #767 into master will decrease coverage by <.01%

1. 17 files (not in diff) in src were modified. more
   • Misses +19
   • Partials -8
   • Hits -11
2. 4 files (not in diff) in include/libtorrent were modified. more
   • Misses +1
   • Partials -1

@@             master       #767   diff @@
==========================================
  Files           264        264          
  Lines         42209      42209          
  Methods        4530       4530          
  Messages          0          0          
  Branches       6754       6754          
==========================================
- Hits          25161      25150    -11   
- Misses        13288      13308    +20   
+ Partials       3760       3751     -9   

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[arvidn]

thanks. I'm not all that familiar with cmake, I take it you feel confident with these changes? (I think most are obvious, but not all). We should probably be a cmake build in the travis build matrix too.

[zeule]

Thank you. Well, I hadn't tried it in a live install yet. Will add python bindings to the cmake build and live test everything then.