FindBLAS: Consider OpenBLAS with thread libraries only with C or CXX
The check added by !3434 (merged) can work only when C or CXX is enabled.
Fixes: #20092 (closed)
Backport: release
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The check added by !3434 (merged) can work only when C or CXX is enabled.
Fixes: #20092 (closed)
Backport: release