We haven't tested plain absolute paths without making them URIs...
Reviewed-by: NAndy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3907)

to_rel_file_uri really treated all files appropriately, absolute and
relative alike, and really just constructs a URI, so gets renamed to
to_file_uri

to_file_uri, on the other hand, forces the path into an absolute one,
so gets renamed to to_abs_file_uri
Reviewed-by: NAndy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3907)

These tests were inspired by OpenConnect and incorporated
by permission of David Woodhouse under CLA
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3542)

Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3542)

Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3542)

Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3542)