[Bug 209100] sysutils/afflib: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209100

            Bug ID: 209100
           Summary: sysutils/afflib: Fix build with libc++ 3.8.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: antoine at FreeBSD.org
          Reporter: dim at FreeBSD.org
          Assignee: antoine at FreeBSD.org
             Flags: maintainer-feedback?(antoine at FreeBSD.org)

Created attachment 169761
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=169761&action=edit
Use bswap macros/functions from sys/endian.h

During the exp-run in bug 208158, it was found that sysutils/afflib gives
errors with libc++ 3.8.0 [1]:

In file included from vnode_qemu.cpp:18:
In file included from ./qemu/qemu-common.h:62:
./qemu/bswap.h:46:24: error: C++ requires a type specifier for all declarations
static inline uint16_t bswap16(uint16_t x)
                       ^
/usr/include/sys/endian.h:59:20: note: expanded from macro 'bswap16'
#define bswap16(x)      __bswap16(x)
                        ^

And similar errors for bswap32() and bswap64().  This is because afflib
attempts to define its own versions of these functions, but newer versions of
libc++ include <sys/endian.h>, which already defines them.  Use the versions
from <sys/endian.h> instead.

[1]
http://package18.nyi.freebsd.org/data/headamd64PR208158-default/2016-03-22_18h30m05s/logs/errors/afflib-3.7.6.log

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