[Bug 197864] Fix devel/libev build with clang 3.6.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197864

            Bug ID: 197864
           Summary: Fix devel/libev build with clang 3.6.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: vsevolod at FreeBSD.org
          Reporter: dim at FreeBSD.org
             Flags: maintainer-feedback?(vsevolod at FreeBSD.org)
          Assignee: vsevolod at FreeBSD.org

Created attachment 153246
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=153246&action=edit
Fix positioning of _Noreturn attribute for libev

During the exp-run in bug 197395, it was found that devel/libev gives errors
with clang 3.6.0:

http://package18.nyi.freebsd.org/data/headamd64PR197395-default/2015-02-11_23h04m51s/logs/errors/libev-4.15_1,1.log

This is because clang 3.6.0 defaults to C11, and libev puts its ecb_noreturn in
the wrong place, at the end of a function declaration.

The placement was fixed by upstream here:

http://cvs.schmorp.de/libev/ev.c?r1=1.473&r2=1.474

but this also has a lot of other unneeded changes.  So I propose the following
minimal fix, which changes just two lines.

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