Fix logic to find sbgemm in BLAS library

[vinithakv]

Current logic to set the HAS_SBGEMM flag is ignored in case the BLAS libraries are found already, ie, if set from environment variable BLAS=OpenBLAS . If BLAS_LIBRARIES are already set the code to find if BLAS_LIBRARY has sbgemm is never executed. The following commit brings out this logic outside unconditionally.

Fixes #ISSUE_NUMBER

cc @frank-wei @jgong5 @mingfeima @XiaobingSuper @sanchitintel @ashokei @jingxu10

[pytorch-bot]

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❌ 3 New Failures, 1 Unrelated Failure

As of commit 5416fac with merge base f7f018a ():

NEW FAILURES - The following jobs have failed:

• pull / linux-focal-py3.11-clang10 / test (dynamo, 3, 3, linux.2xlarge) (gh)
  functorch/test_aotdispatch.py::TestAOTAutograd::test_some_output_requires_grad_input_doesnt
• pull / linux-focal-py3.12-clang10 / test (dynamo, 3, 3, linux.2xlarge) (gh)
  functorch/test_aotdispatch.py::TestAOTAutograd::test_some_output_requires_grad_input_doesnt
• pull / linux-focal-py3.8-clang10 / test (dynamo, 3, 3, linux.2xlarge) (gh)
  functorch/test_aotdispatch.py::TestAOTAutograd::test_some_output_requires_grad_input_doesnt

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / linux-focal-cuda11.8-py3.10-gcc9 / test (distributed, 3, 3, linux.8xlarge.nvidia.gpu) (gh) (trunk failure)
  distributed/tensor/parallel/test_tp_examples.py::DistTensorParallelExampleTest::test_transformer_training_is_seq_parallel_True

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[vinithakv]

Hi,
Requesting for review .

Regards,
Vinitha