ENH: Update python-cmake-buildsystem version

$ git shortlog 39ccab0..30b0d56 --no-merges
David Brooks (2):
Correctly name the installed include and library configuration directories.
Set PLATFORM_TRIPLET as per Python's configure script.

Jean-Christophe Fillion-Robin (9):
ConfigureChecks: Add support for system not expecting "libutil" (e.g VxWorks)
ConfigureChecks: Ensure LIBUTIL_LIBRARIES is set after first configure
circleci: simplify load/pull/save of docker images using scikit-ci-addons
extension_ctypes: Fix compilation on linux-x86
circleci: Use dockcross scripts
cmake: Change version built by default from 2.7.12 to 3.5.2
circleci: Enable parallel build using circleci-matrix
circleci: Speed-up build using system python
Add support for Python 2.7.13

Jérémy Viau-Trudel (1):
change default python version on readme.md

Marcel Metz (1):
Replace remaining instances of BUILD_{SHARED,STATIC} control variable

Martin Oberhuber (2):
ConfigureChecks: libutil is now optional. See 0000163
ConfigureChecks: VxWorks: Disable _XOPEN_SOURCE due to "sys/select.h" failing

git-svn-id: http://svn.slicer.org/Slicer4/trunk@25955 3bd1e089-480b-0410-8dfb-8563597acbee