message: Also include util_win32.c because something will probably break otherwise
diff: @@ -522,7 +522,8 @@ libbitcoin_common_a_SOURCES = \
  if TARGET_WINDOWS
  libbitcoin_common_a_SOURCES += \
  cpp-ethereum/libethash/io_win32.c \
  - cpp-ethereum/libethash/mmap_win32.c
  + cpp-ethereum/libethash/mmap_win32.c \
  + cpp-ethereum/libethash/util_win32.c
  else
  libbitcoin_common_a_SOURCES += cpp-ethereum/libethash/io_posix.c
  endif
  