Tests updated: cpu/spu_alu and cpu/spu_fpu

* Updated spu_fpu.spu.cpp and it's ELF file in order to printf the
immediate value in the conversion instructions.

* Added *.expected files: Note that a few entries in spu_alu.expected
contain "???????? ???????? ???????? ????????" as value. That's because a
problem happened while printf'ing the value from the PS3. This will be
fixed in the future.