new xz in Rawhide and "md5 mismatch of result" errors in rebuilding drpms

[Andre Robatino]

A new version of xz (xz-4.999.9-0.3.beta.212.gacbc.fc15) was built and pushed to
Rawhide on October 16. Today, I saw several "md5sum mismatch of result" errors
in rebuilding drpms. In each case, the drpm rebuild failed if and only if the
corresponding new rpm was built before the xz update. (For example,
java-1.6.0-openjdk-1.6.0.0-41.b18.fc13_1.6.0.0-44.1.9.1.fc14.x86_64.drpm failed
to rebuild, and java-1.6.0-openjdk-1.6.0.0-44.1.9.1.fc14.x86_64 was built on
October 13.)