[Bug 271851] textproc/opensp: fix build with clang 16 on i386

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271851

            Bug ID: 271851
           Summary: textproc/opensp: fix build with clang 16 on i386
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: dim@FreeBSD.org

Since clang 16 (and gcc 11) the default C++ standard is now gnu++17.
Because textproc/opensp's build infrastructure does not explicitly set
its C++ standard, this leads to an error:

  Recognizer.cxx:42:3: error: ISO C++17 does not allow 'register' storage class
specifier [-Wregister]
    register const Trie *pos = trie_.pointer();
    ^~~~~~~~~

To work around the error, define the register keyword away using
CPPFLAGS.

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