When you change this to true, you may need to add more tests.
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unless main thread is already exited. Otherwise main thread could be
wrongly interrupted when it uses rb_thread_call_without_gvl(). Patch
by Takehiro Kubo. [Bug #11237][ruby-dev:49044][GH-898]
* test/-ext-/gvl/test_last_thread.rb: new test for the above fix.
* ext/-test-/gvl/call_without_gvl/call_without_gvl.c: new ext for the
above test.
* ext/-test-/gvl/call_without_gvl/extconf.rb: ditto.
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