[crac] RFR: Fix Windows build of Decoder

[Radim Vansa]

Fixes build failure on Windows introduced in https://github.com/openjdk/crac/pull/116

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

Commit messages:
 - Fix windows build of Decoder

Changes: https://git.openjdk.org/crac/pull/138/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=138&range=00
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/crac/pull/138.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/138/head:pull/138

PR: https://git.openjdk.org/crac/pull/138