Extended (stderr) data: buffering and flow control #2128

Job	Run time
create_matrix	5s
Build wolfssl (ubuntu-latest, v5.9.2-stable)	3s
Build wolfssl (ubuntu-latest, v5.9.1-stable)	3s
Build wolfssl (ubuntu-latest, master)	6s
Build and test wolfsshd (ubuntu-latest, master)	2m 32s
Build and test wolfsshd (ubuntu-latest, v5.9.1-stable)	2m 43s
Build and test wolfsshd (ubuntu-latest, v5.9.2-stable)	2m 32s
	8m 4s

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