[Bug 206527] Fix emulators/wine and emulators/wine-devel build with clang 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206527

            Bug ID: 206527
           Summary: Fix emulators/wine and emulators/wine-devel build with
                    clang 3.8.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: gerald at FreeBSD.org
          Reporter: dim at FreeBSD.org
             Flags: maintainer-feedback?(gerald at FreeBSD.org)
          Assignee: gerald at FreeBSD.org

Created attachment 166008
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=166008&action=edit
Fix emulators/wine and emulators/wine-devel build with clang 3.8.0

During the exp-run in bug 206074, it was found that emulators/wine and
emulators/wine-devel give errors with a recent clang 3.8.0 snapshot [1]:

eventlog.c:997:5: error: 'va_start' used in Win64 ABI function
    __ms_va_start( valist, number );
    ^
../../include/windef.h:90:35: note: expanded from macro '__ms_va_start'
#  define __ms_va_start(list,arg) __builtin_ms_va_start(list,arg)
                                  ^
<command line>:5:31: note: expanded from here
#define __builtin_ms_va_start __builtin_va_start
                              ^
This is because the port Makefile explicitly defines __builtin_ms_va_list as
__builtin_va_list, __builtin_ms_va_start as __builtin_va_start, and so on, for
clang.

For clang 3.8.0 and higher this is no longer needed, as it supports the
'native' MS varargs builtins now.  The attached patch adds a version check.

[1]
http://package18.nyi.freebsd.org/data/headamd64PR206074-default/2016-01-15_15h26m58s/logs/errors/wine-1.8,1.log
[2]
http://package18.nyi.freebsd.org/data/headamd64PR206074-default/2016-01-15_15h26m58s/logs/errors/wine-devel-1.9.1,1.log

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