tree d7fd769355344ab17c6923bf156d2062e2c70620
parent 352b320ab1b5438a0838aea09cbbf07fa4ff5d71
author Sameer Agarwal <sameeragarwal@google.com> 1669507348 -0800
committer Sameer Agarwal <sameeragarwal@google.com> 1669611993 -0800

Remove OpenMP and No threading backends.

Since c++11, we can depend on C++ threads always being available.
With the recent work on the performance of CXX threading, the
additional complexity of maintaining multiple backends for some
minor performance delta is not worth it

https://github.com/ceres-solver/ceres-solver/issues/886

Change-Id: Idee480b22a498daec9c4366da8589aa58eaf36a1