Fix a possible typo in the vendor name derivation logic

Pushkar Kulkarnirequested to merge
pushkarnk/openjdk:correct-typo into master

While deciding the vendor details we need to be matching the value of v_pkgrel i.e $(v_pkgrel) with the given regex.

This commit needs to be back-ported to the openjdk-22, openjdk-21 and openjdk-17 branches.

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