Fix use of crc32c 3way on portable builds using MSVC (#10667)

Fix use of crc32c 3way on portable builds using MSVC (#10667)

Summary:
Hello,
As discussed previously in this [discussion](https://github.com/facebook/rocksdb/pull/9680#discussion_r853105163), the mentioned PR introduced a regression in portable versions that compile with MSVC - crc_3way optimization won't be used even in cases where it is supported.

This PR aims to fix just that.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10667

Reviewed By: akankshamahajan15

Differential Revision: D40644592

Pulled By: ajkr

fbshipit-source-id: dadbeb10d57c19800e74288258ec3b96095557dd