Merge #156: Pin version of build dependency cc to <1.0.42

845bff25 Bump version to 0.15.4 (Steven Roose)
07ef3a1f Pin version of build dependency cc to <1.0.42 (Steven Roose)

Pull request description:

  Version 1.0.42 broke compatibility with rustc 1.22.0.

ACKs for top commit:
  jonasnick:
    ACK 845bff25

Tree-SHA512: 21161e6e85494d064b45b9800baa0355784e3b47772dff2716f049b1b15c047832ceb756b2031ef73374952c21aa04a8852a333eb3edbb73f5608c7ce8344c12