Add ossl_is_absolute_path function to detect absolute paths

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13306)

Avoid duplicate ends_with_dirsep functions

Refactor them into inline ossl_ends_with_dirsep function in
internal/cryptlib.h.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Mer

Avoid duplicate ends_with_dirsep functions

Refactor them into inline ossl_ends_with_dirsep function in
internal/cryptlib.h.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13306)

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