[Bug 282166] devel/bazel5: fix build with clang 19

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282166

            Bug ID: 282166
           Summary: devel/bazel5: fix build with clang 19
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: vishwin@freebsd.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(vishwin@freebsd.org)
          Assignee: vishwin@freebsd.org

Clang 19 has become more strict about C23 extensions, which results in
errors building devel/bazel5:

  external/upb/upb/upb.c:215:25: error: defining a type within
'__builtin_offsetof' is a C23 extension [-Werror,-Wc23-extensions]
    215 |   n = UPB_ALIGN_DOWN(n, UPB_ALIGN_OF(upb_arena));
        |                         ^~~~~~~~~~~~~~~~~~~~~~~
  external/upb/upb/port_def.inc:94:38: note: expanded from macro 'UPB_ALIGN_OF'
     94 | #define UPB_ALIGN_OF(type) offsetof (struct { char c; type member; },
member)
        |                                      ^~~~~~
  /usr/include/stddef.h:64:42: note: expanded from macro 'offsetof'
     64 | #define offsetof(type, field)   __offsetof(type, field)
        |                                            ^~~~
  /usr/include/sys/cdefs.h:324:53: note: expanded from macro '__offsetof'
    324 | #define __offsetof(type, field)  __builtin_offsetof(type, field)
        |                                                     ^~~~
  external/upb/upb/port_def.inc:92:48: note: expanded from macro
'UPB_ALIGN_DOWN'
     92 | #define UPB_ALIGN_DOWN(size, align) ((size) / (align) * (align))
        |                                                ^~~~~

To work around this, amend extra-patch-upb_bazel_build__defs.bzl to also
add -Wno-c23-extensions. Alternatively, the -Werror option could be
taken out.

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