* spu/jsre.h: Add new JSRE opcodes.
* spu/dup2.c: New file to add dup2 support via assist call.
* spu/fdatasync.c: New file to add fdatasync support via assist call.
* spu/fsync.c: New file to add fsync support via assist call.
* spu/lockf.c: New file to add lockf support via assist call.
* spu/sync.c: New file to add sync support via assist call.
* spu/truncate.c: New file to add truncate support via assist call.
* spu/Makefile.in: Add new files.
