Add rb_proc_call_with_block to native extension API

[nirvdrum]

The in-development version of msgpack-ruby uses rb_proc_call_with_block. That method isn't yet implemented in TruffleRuby, so the code errors out. Reported by @casperisfine.

Sample exception:

4) MessagePack::Factory#register_type registers custom packer method name
    Failure/Error: data = subject.packer.write(src).to_s
 
    Polyglot::ForeignException:
      External LLVMFunction rb_proc_call_with_block cannot be found.
    #./ext/msgpack/packer.c:109:in `msgpack_packer_try_write_with_ext_type_lookup'
    # ./ext/msgpack/packer.c:154:in `msgpack_packer_write_value'
    # ./ext/msgpack/packer_class.c:139:in `Packer_write'
    # /home/runner/.rubies/truffleruby-23.0.0-preview1/lib/truffle/truffle/cext_ruby.rb:41:in `<unknown>'
    # /home/runner/.rubies/truffleruby-23.0.0-preview1/lib/truffle/truffle/cext_ruby.rb:41:in `MessagePack::Packer#write'
    # ./spec/factory_spec.rb:231:in `block (3 levels) in <top (required)>'

Full log

[casperisfine]

NB: that's the one I tried to use, but it's a whole family of functions:

VALUE rb_proc_call(VALUE recv, VALUE args);
VALUE rb_proc_call_kw(VALUE recv, VALUE args, int kw_splat);
VALUE rb_proc_call_with_block(VALUE recv, int argc, const VALUE *argv, VALUE proc);
VALUE rb_proc_call_with_block_kw(VALUE recv, int argc, const VALUE *argv, VALUE proc, int kw_splat);

I know little of TruffleRuby, but a quick search suggest VALUE rb_proc_call(VALUE recv, VALUE args) is the only implemented one.