invoke service subprocess. mark detach threads for clean up.
* test/drb/drbtest.rb: clean up the service subprocess in teardown.
* test/drb/test_drb.rb: set @service_name for teardown.
* test/drb/test_drbunix.rb: ditto.
* test/drb/test_drbssl.rb: ditto.
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exceptions, instead of the first argument.
* process.c (rb_spawn): ditto.
* process.c (proc_spawn_v): use first argument as program name.
* win32/win32.c (rb_w32_aspawn): ditto.
* win32/win32.c (CreateChild): search executable file if no program
name given.
* lib/drb/extservm.rb (invoke_service_command): use Process.spawn.
[ruby-dev:23103]
* lib/rdoc/ri/ri_display.rb (setup_pager): use IO.popen.
[ruby-dev:23086], [ruby-dev:23103]
* lib/rdoc/diagram.rb (convert_to_png): ditto.
* lib/rdoc/generators/chm_generator.rb (compile_project): ditto.
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