Test various deprecated PEM_read_bio_* APIs

Add tests for various deprecated PEM_read_bio_*() functions to ensure
they can still read the various files.

Reviewed-by: Richard Lev

Test various deprecated PEM_read_bio_* APIs

Add tests for various deprecated PEM_read_bio_*() functions to ensure
they can still read the various files.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13329)

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