[crac] RFR: Fix compilation error on OSX

[Jan Kratochvil]

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.

-------------

Commit messages:
 - Fix compilation error on OSX

Changes: https://git.openjdk.org/crac/pull/120/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=120&range=00
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/crac/pull/120.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/120/head:pull/120

PR: https://git.openjdk.org/crac/pull/120