Test that PEM_BUFSIZE is passed into pem_password_cb

When pem_password_cb is used from SSL_CTX, its size
parameter should be equal to PEM_BUFSIZE.

Reviewed-by: Ben Kaduk <kaduk@

Test that PEM_BUFSIZE is passed into pem_password_cb

When pem_password_cb is used from SSL_CTX, its size
parameter should be equal to PEM_BUFSIZE.

Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/17320)

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