input_thread: macos: Add a missing pthread_cond_init
input_thread: macos: Add a missing pthread_cond_init

On macOS, don't wait on a condition that is not initialized yet.
We must initialize it at first.

ref: https://github.com/lemmy/BlockingQueue/issues/3

Signed-off-by: Hiroshi Hatake <a476a6e5b5893650242fbf0b2961500a9bd9032e@calyptia.com>

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