Fixes <https://issues.guix.gnu.org/68333>, as well.
This is a companion to commit 5c0f77f424.
* gnu/packages/java.scm (openjdk9)[source]: Add patch.
* gnu/packages/patches/openjdk-currency-time-bomb.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
Change-Id: I45ca1fe5bad922307eba64d46a330a8f233c0f55
