configure fails to find oneDNN about flashlight

[jacobkahn]

@yurivict oneDNN breaks their API with new releases -- I'm working on supporting 3.0+. Thanks for reporting.

[vpirogov]

oneDNN follows semantic versioning. API breaks only between major versions. Minor versions are API compatible.

[tlyong3]

@jacobkahn any update on your fix for oneDNN 3.x support? I forced it to build with v3.0 or 3.1 but getting many errors such as this:
/root/flashlight/flashlight/fl/tensor/backend/onednn/OneDnnBackend.cpp:180:18: error: ‘const struct dnnl::memory::desc’ has no member named ‘data_type’; did you mean ‘get_data_type’?
180 | lhsMemDesc.data_type(), rhsMemDesc.data_type()));
| ^~~~~~~~~
| get_data_type

[jacobkahn]

@tlyong3 — this continues to be a work in progress. We're awaiting some more correctness checks on our end and ensuring oneDNN 3.0 works on all of our build environments; pending that, I'll move everything over.