Build warnings with make option --enable-ipv6

[semihalf-berestovskyy-andriy]

Causes the below build warnings:

../include/ofpi_util.h:129:36: warning: cast increases required alignment of target type [-Wcast-align]
  return (((*(uint64_t *)addr1 ==  *(uint64_t *)addr2) &&
                                    ^
../include/ofpi_util.h:130:5: warning: cast increases required alignment of target type [-Wcast-align]
   (*(uint64_t *)(addr1 + 8) ==  *(uint64_t *)(addr2 + 8)))
     ^
../include/ofpi_util.h:130:34: warning: cast increases required alignment of target type [-Wcast-align]
   (*(uint64_t *)(addr1 + 8) ==  *(uint64_t *)(addr2 + 8)))
                                  ^
  CC       cli/ofp_cli_debug.lo
In file included from cli/ofp_cli_debug.c:14:0:
../include/ofpi_util.h: In function 'ofp_ip6_is_set':
../include/ofpi_util.h:125:12: warning: cast increases required alignment of target type [-Wcast-align]
  return ((*(uint64_t *)addr | *(uint64_t *)(addr + 8)) == 0 ? 0 : 1);
            ^
../include/ofpi_util.h:125:32: warning: cast increases required alignment of target type [-Wcast-align]
  return ((*(uint64_t *)addr | *(uint64_t *)(addr + 8)) == 0 ? 0 : 1);
                                ^
../include/ofpi_util.h: In function 'ofp_ip6_equal':
../include/ofpi_util.h:129:13: warning: cast increases required alignment of target type [-Wcast-align]
  return (((*(uint64_t *)addr1 ==  *(uint64_t *)addr2) &&
             ^
../include/ofpi_util.h:129:36: warning: cast increases required alignment of target type [-Wcast-align]
  return (((*(uint64_t *)addr1 ==  *(uint64_t *)addr2) &&
                                    ^
../include/ofpi_util.h:130:5: warning: cast increases required alignment of target type [-Wcast-align]
   (*(uint64_t *)(addr1 + 8) ==  *(uint64_t *)(addr2 + 8)))
     ^
../include/ofpi_util.h:130:34: warning: cast increases required alignment of target type [-Wcast-align]
   (*(uint64_t *)(addr1 + 8) ==  *(uint64_t *)(addr2 + 8)))

[semihalf-berestovskyy-andriy]

Note: the comment was created automatically with bugzilla2github tool

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Bugzilla bug ID: 9
Renumbered to issue: #128