[Bug 271712] devel/py-greenlet: fix build with clang 16 on i386

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271712

            Bug ID: 271712
           Summary: devel/py-greenlet: 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: sunpoet@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(sunpoet@FreeBSD.org)
          Assignee: sunpoet@FreeBSD.org

Since clang 16 (and gcc 11) the default C++ standard is now gnu++17.
Because devel/py-greenlet's build infrastructure does not explicitly set
its C++ standard, this leads to several errors:

  In file included from src/greenlet/greenlet.cpp:21:
  In file included from src/greenlet/greenlet_slp_switch.hpp:82:
  In file included from src/greenlet/slp_platformselect.h:18:
  src/greenlet/platform/switch_x86_unix.h:54:5: error: ISO C++17 does not allow
'register' storage class specifier [-Wregister]
      register int *stackref, stsizediff;
      ^~~~~~~~~
  src/greenlet/platform/switch_x86_unix.h:54:5: error: ISO C++17 does not allow
'register' storage class specifier [-Wregister]
      register int *stackref, stsizediff;
      ^~~~~~~~~

The register keyword has already been removed from the similar
switch_amd64_unix.h header, which is why the above problem does not
occur on amd64. To work around the errors, define the register keyword
away using CPPFLAGS.

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