demos: tidy up makefiles, fix warnings

Update makefiles so that consistent patterns are used. Object files
are compiled from source using an implicit rule (but using our
CFLAGS); fo

demos: tidy up makefiles, fix warnings

Update makefiles so that consistent patterns are used. Object files
are compiled from source using an implicit rule (but using our
CFLAGS); for linking, we give an explicit rule. Ensure that "make
test" works in each subdirectory (even if it does not actually run any
applications). The top-level demo makefile now works.

The makefiles are not make-agnostic. e.g. they use the variable $(RM)
in "clean" recipes, which is defined in gnu-make but may not be
defined in others.

Part of #17806

Testing:

$ cd demo
$ make test

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22698)

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Copyright year updates


Reviewed-by: Richard Levitte <levitte@openssl.org>
Release: yes

Fixup demo exit status magic numbers

The demo code is quite often block copied for new demos,
so this PR changes demos to use EXIT_SUCCESS & EXIT_FAILURE
instead of using 0 and 1.

Fixup demo exit status magic numbers

The demo code is quite often block copied for new demos,
so this PR changes demos to use EXIT_SUCCESS & EXIT_FAILURE
instead of using 0 and 1.
Internal functions use the normal notation of 0 = error, 1 = success,
but the value returned by main() must use EXIT_SUCCESS and EXIT_FAILURE.

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20545)

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Add EVP demos for RSA-PSS signing and verification

Two demos are provided: one using RSA-PSS directly in which a digest
must be provided, and one using RSA-PSS with the EVP_DigestSign AP

Add EVP demos for RSA-PSS signing and verification

Two demos are provided: one using RSA-PSS directly in which a digest
must be provided, and one using RSA-PSS with the EVP_DigestSign APIs
which performs the hashing for you.

Fixes #14113.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17800)

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