[crac] RFR: Fix compilation error on OSX

[Radim Vansa]

On Fri, 29 Sep 2023 09:07:14 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

> src/hotspot/os/posix/crac_posix.cpp:43:6: error: use of undeclared identifier 'crac'
> void crac::vm_create_start() {
>      ^
> src/hotspot/os/posix/crac_posix.cpp:60:6: error: use of undeclared identifier 'crac'
> bool crac::read_bootid(char *dest) {
>      ^
> 2 errors generated.

Marked as reviewed by rvansa (Committer).

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PR Review: https://git.openjdk.org/crac/pull/120#pullrequestreview-1650376524