[Bug 196629] Fix multimedia/mjpegtools with libc++ r224926

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196629

            Bug ID: 196629
           Summary: Fix multimedia/mjpegtools with libc++ r224926
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: dim at FreeBSD.org

Bug 196535 shows that multimedia/mjpegtools fails to compile when libc++
r224926 is imported:

http://package18.nyi.freebsd.org/data/headamd64PR196535-default/2015-01-07_20h10m47s/logs/errors/mjpegtools-2.1.0_7.log

This is because one of the submodules tries to redefine 'errno' as a local
variable, and the new version of libc++ pulls in <errno.h> now, leading to a
conflict.

The fix is to rename the local variable to 'error'.

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