Log Message:
games/xblast: Fix unicode translation error during installation

Likely a mistake, one of the "levels" source files used unicode in the
filename.  The manifest even indicated the name should have been
"reconstruction2.xal".

The post-extract hook is used to correct the filename to be as intended.
As a bonus, platforms like Linux and DragonFly can install the package
without a libarchive translation error disrupting the process.