mjit_worker.c: suppress child process's output properly

Prior to this commit, some of parent process's output was unintentionally
suppressed. We couldn't suppress only child process's output with spawnvp.

Instead of that, this commit uses CreateProcess directly to redirect stdout
and stderr only for child process.

As it's dealing with HANDLE returned from CreateProcess, now waitpid macro
needs to CloseHandle it.

win32/win32.c: Introduce rb_w32_start_process which is designed for MJIT
worker. Other similar functions can't be used since they are using ALLOCV
that may trigger GC, which should be avoided on MJIT worker.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65033 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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