[Bug 218859] net/dhcp6: sometimes fails to build with poudriere due to parallel make issues

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218859

            Bug ID: 218859
           Summary: net/dhcp6: sometimes fails to build with  poudriere
                    due to parallel make issues
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: hrs at FreeBSD.org
          Reporter: leres at ee.lbl.gov
             Flags: maintainer-feedback?(hrs at FreeBSD.org)
          Assignee: hrs at FreeBSD.org

I have 24-core poudriere build server that does daily builds and is great for
detecting parallel build problems. Occasionally it fails to build net/dhcp6 and
when it does the build log shows three attempts to rename y.tab.c to cfparse.c
but only the two succeed (see attached).

I believe the problem is that the Makefile has an explicit (but unnecessary
dependency) for y.tab.h. When a parallel make happens to build y.tab.h and
cftoken.c at the same time one of these fails.

Clearly y.tab.h will be created as a side effect of running flex on cftoken.l
to create cftoken.c and only cftoken.c includes y.tab.h so my patch removes the
unnecessary dependency. 

I also submitted the attached patch to upstream back in February:

    https://sourceforge.net/p/wide-dhcpv6/bugs/38/

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