Native api fix rdebug recursion alt

[iMacTia]

Description

Adds commit on top of #1204

Todos

List any remaining work that needs to be done, i.e:

• Test with ruby-debug

[native-api]

A way to test with -rdebug is:

$ bundle exec ruby -rdebug -e "require 'faraday'; puts Faraday::VERSION;" <<!
b foo:1
c
!

[native-api]

I confirm the PR to work:

bundle exec ruby -rdebug -e "require 'faraday'; puts Faraday::VERSION;" <<!
b foo:1
c
!
/home/vmuser/.rvm/rubies/ruby-2.5.8/lib/ruby/2.5.0/x86_64-linux/continuation.so: warning: callcc is obsolete; use Fiber instead
Debug.rb
Emacs support available.

/home/vmuser/.rvm/rubies/ruby-2.5.8/lib/ruby/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:35:    RUBYGEMS_ACTIVATION_MONITOR.enter
(rdb:1) b foo:1
Set breakpoint 1 at foo:1
(rdb:1) c
1.1.0