Carry patch for xianyi/OpenBLAS/pull/2729

[h-vetinari]

Also, turn gfortran-diff into proper patch & put patches into folder.
Remove now-unnecessary patch to revert OpenMathLib/OpenBLAS/pull/2516.

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

Fixes #101

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[h-vetinari]

@conda-forge-admin, please rerender

[h-vetinari]

@isuruf, not sure if there's anything to revert about the pthread handling (which IIUC was also a reaction to mitigate the segfaults), I'll leave that to you.

[isuruf]

Thanks

[h-vetinari]

The ppc64le build for python 3.7 timed out upon merging this PR:

THE FOLLOWING PARAMETER VALUES WILL BE USED:
   FOR N                   0     1     2     3     5     9    35
   FOR ALPHA          ( 0.0, 0.0)  ( 1.0, 0.0)  ( 0.7,-0.9)  
   FOR BETA           ( 0.0, 0.0)  ( 1.0, 0.0)  ( 1.3,-1.1)  
 ROUTINES PASS COMPUTATIONAL TESTS IF TEST RATIO IS LESS THAN  
No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#build-times-out-because-no-output-was-received
The build has been terminated

[isuruf]

Thanks. Restarted it.

Btw, it'd be great to have you as a maintainer here. Let me know and I can add you.

[h-vetinari]

@isuruf: Btw, it'd be great to have you as a maintainer here. Let me know and I can add you.

Thanks for the invitation, I'd be willing to help where I can. :)