[crac] RFR: Fix builds

[Jan Kratochvil]

On Sat, 12 Aug 2023 11:48:03 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

> Fix builds in vairous configurations

src/hotspot/cpu/s390/vm_version_s390.hpp line 571:

> 569: 
> 570:   // No _features_names[] available on this CPU.
> 571:   static void insert_features_names(char* buf, size_t buflen, unsigned long features[] = _features) {}

I do not see a reason for this change. How to test the s390 build?

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PR Review Comment: https://git.openjdk.org/crac/pull/104#discussion_r1292776247