devel/ghidra: Fix build error caused by cache cleanup
The issue seems to be caused by Gradle caches being cleaned up
between build sessions . It did not come up before because the
cached files were not old enough to be deleted.
Cleanup happens after a build session, so running the two build
targets (yajswDevUnpack and buildGhidra) in the same session fixes
Submitted by: Tamas Szakaly <email@example.com> (maintainer)