Revert "Merge branch 'winrt' of https://github.com/MSOpenTech/config into winrt"

This reverts commit 779a228f0f61f60c6322244b7a4c56aa692368b8, reversing
changes made to 9ea3497e0a59e2636c451cfef9308d6f80bf67f9.

Conflicts:
	test/boost_no_cxx11_hdr_regex.ipp