Update ethash

Godeps/Godeps.json

Godeps/_workspace/src/github.com/ethereum/ethash/.travis.yml

.../_workspace/src/github.com/ethereum/ethash/CMakeLists.txt

Godeps/_workspace/src/github.com/ethereum/ethash/ethash.go

...c/github.com/ethereum/ethash/src/benchmark/CMakeLists.txt

...rc/github.com/ethereum/ethash/src/benchmark/benchmark.cpp

...ithub.com/ethereum/ethash/src/libethash-cl/CMakeLists.txt

....com/ethereum/ethash/src/libethash-cl/ethash_cl_miner.cpp

...ub.com/ethereum/ethash/src/libethash-cl/ethash_cl_miner.h

...c/github.com/ethereum/ethash/src/libethash/CMakeLists.txt

...src/github.com/ethereum/ethash/src/libethash/data_sizes.h

...ace/src/github.com/ethereum/ethash/src/libethash/ethash.h

...e/src/github.com/ethereum/ethash/src/libethash/internal.c

...rkspace/src/github.com/ethereum/ethash/src/libethash/io.c

...rkspace/src/github.com/ethereum/ethash/src/libethash/io.h

...e/src/github.com/ethereum/ethash/src/libethash/io_posix.c

...e/src/github.com/ethereum/ethash/src/libethash/io_win32.c

...orkspace/src/github.com/ethereum/ethash/src/python/core.c

...pace/src/github.com/ethereum/ethash/test/c/CMakeLists.txt

..._workspace/src/github.com/ethereum/ethash/test/c/test.cpp