Updated openblas from validate to validate_build

[queltosh]

Specify library name and version: openblas/*

fixes #24037

Validation method fails on cross compilation environment despite native packages are in repo. Apparently is because validate is run always, and this validations should be run only on build stage. Renaming the method name to validate_build looks better approach.

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[memsharded]

I'd say it is likely that the only condition that needs to be moved to validate_build() is the one:

raise ConanInvalidConfiguration("Cross-building not implemented")

All the other condition seem good as validate(), those are not about cross-building but they are also meant for consumption of the package, irrespective of the build, so those are good in validate()

[jcar87]

superseded by #24171 - please reopen (or open a new issue) if something is missing, thank you!