Add pybind11 patches

[KyleFromKitware]

This adds a set of patches to pybind11 that fixpybind/pybind11#1276 (the changes I've made can be seen in pybind/pybind11#1286)

[dstoup]

A comment about patch branches in general. I prefer 2 commits. One which pushes the original files and a second which applies the patch. That will allow reviewers to see what's actually being changed.

[KyleFromKitware]

Like this?

[dstoup]

Yes, thank you :)

[dstoup]

Jenkins test this please

[kwcvrobot]

KWJenkins-FletchMacPR-325 failed to configure.

[kwcvrobot]

KWJenkins-FletchWindowsPR-325 experienced errors.

[KyleFromKitware]

The builds are failing:

CMake Error at CMake/External_Tensorflow.cmake:4 (message):
Error: A build with Python is required for building Tensorflow

Is Jenkins not configured for Python? Does this usually happen?

[dstoup]

FYI, this is more for Dawkins than anyone, but if there are useful changes being made, I would prefer they go into master, not some frankenbranch which will not merge.

Are these changes useful for pybind11 in general?

[hughed2]

Kyle, do you want to push that into viame/master or plain master? Jenkins is configured for master, if viame/master needs anything different I wouldn't expect it to work.

[dstoup]

Jenkins is not configured with python and any packages which are added need to assume it can be turned on or off.

[dstoup]

@hughed2 this branch cannot go into master, it was taken from viame/master.