mutex.h, private member is inaccessible

[cthom055]

System information

• msvc v140:

Problem

mutex.h, Ln 145
condition_variable cannot access private member mu_ in mutex, when compiling a standalone c++ project on Windows.

Solution

Forward declare condition variable in mutex.h. I have created a pull request.

[bignamehyp]

Waiting #14389

[tensorflowbutler]

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