OpenSSL: update Makefiles to reflect 3.5.1 release

This is a targeted effort to update the INCS and SRCS entries for
libcrypto, the legacy provider, and libssl to match what upstream
(OpenSSL) builds in their respective libraries.

The number of stylistic changes were kept at a minimum.

Another incoming change will reformat this file to make future
maintenance easier.

MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D52554

(cherry picked from commit d5984d5f29a7c717b88ccd17a85a747792403cdf)