[Bug 208528] devel/ddd: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208528

            Bug ID: 208528
           Summary: devel/ddd: 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: freebsd-ports-bugs at FreeBSD.org
          Reporter: dim at FreeBSD.org
                CC: sergio at softshark.org
                CC: sergio at softshark.org
             Flags: maintainer-feedback?(sergio at softshark.org)

Created attachment 168982
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=168982&action=edit
Remove C++ keyword overriding defines from devel/ddd

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

In file included from LabelH.C:36:
In file included from /usr/local/include/Xm/XmP.h:45:
In file included from /usr/local/include/Xm/Xm.h:59:
In file included from /usr/local/include/X11/Intrinsic.h:53:
In file included from /usr/local/include/X11/Xlib.h:51:
In file included from /usr/include/c++/v1/stddef.h:51:
/usr/include/c++/v1/__nullptr:35:15: error: unknown type name 'a_class'; did
you mean 'class'?
    template <class _Tp>
              ^
LabelH.C:34:15: note: expanded from macro 'class'
#define class a_class
              ^

This is because several source files in this package attempt to redefine the
C++ keywords 'new' and 'class' with different identifiers, probably because
very old Motif headers abused those keywords as variables or parameters.  This
is not needed anymore, and the keyword redefinitions can be deleted without
problems.

[1]
http://package18.nyi.freebsd.org/data/headamd64PR208158-default/2016-03-22_18h30m05s/logs/errors/ddd-3.3.12_1.log

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