ffi/unsafe win32: fix inefficiency in call-in-orig-thread mode
The problem made simultaneous rendering of "plot" and "math" documentation about 10 times slower than it should be.
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@ -10803,7 +10803,7 @@ void scheme_wait_until_signal_received(void)
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# endif
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#else
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# if defined(WINDOWS_PROCESSES) || defined(WINDOWS_FILE_HANDLES)
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WaitForSingleObject((HANDLE)scheme_break_semaphore, 0);
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WaitForSingleObject((HANDLE)scheme_break_semaphore, INFINITE);
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# endif
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#endif
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