[Bug 271540] net/rubygem-grpc: fix build with clang 16

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271540

            Bug ID: 271540
           Summary: net/rubygem-grpc: fix build with clang 16
           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
          Assignee: sunpoet@FreeBSD.org
             Flags: maintainer-feedback?(sunpoet@FreeBSD.org)

Clang 16 has a new error about incompatible function types, which shows
up when building net/rubygem-grpc:

  rb_channel.c:764:40: error: incompatible function pointer types passing
'VALUE (VALUE)' (aka 'unsigned long (unsigned long)') to parameter of type
'VALUE (*)(void *)' (aka 'unsigned long (*)(void *)')
[-Wincompatible-function-pointer-types]
    background_thread = rb_thread_create(run_poll_channels_loop, NULL);
                                         ^~~~~~~~~~~~~~~~~~~~~~
  /usr/local/include/ruby-3.1/ruby/internal/intern/thread.h:190:32: note:
passing argument to parameter 'f' here
  VALUE rb_thread_create(VALUE (*f)(void *g), void *g);
                                 ^

Fix it by adjusting the parameters for the thread callback functions.

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