For Grasshopper OMAC_ACPKM, OMAC and MAGMA, support XOF

XOF (eXtendable-Output Function) is supported in OpenSSL since version
1.1.1.  Unfortunately, that support is limited, as it requires calling
EVP_DigestFinalXOF().  However, the grasshopper code wasn't compatible.

This changeset adds XOF support in grasshopper

This changeset removes the _meth_ calls from test_grasshopper.c (they
should never have been there, but considering support for XOF came so
late in OpenSSL, their presence is understandable) and uses supported
functionality for this sort of thing instead.

Cleanup tests

It's set correctly when these tests are started with ctest, and
otherwise, we leave it to the user to decide.  Either way, we set it
to a bogus value when it isn't previously set...

An OPENSSL_CONF from the user may cause trouble

test/run_tests: when ctest is verbose, make TAP::Harness verbose too

test/run_tests: extend support for more operating systems

Not all systems recognise LD_LIBRARY_PATH, and we therefore need to
set other environment variables.

Currently set:

- LD_LIBRARY_PATH (Linux and ELF HP-UX)
- DYLD_LIBRARY_PATH (MacOS X)
- LIBPATH (AIX, OS/2)

More can be added as the need arises.

Fixes #146

test/run_tests: Always set paths when OPENSSL_ROOT_DIR is defined

That will add the pkg-config on FreeBSD

When the environment variable OPENSSL_ROOT_DIR is defined, we need to
ensure that PATH and LD_LIBRARY_PATH are properly affected.

This is a little bit complicated, since OPENSSL_ROOT_DIR could point
at an OpenSSL build directory as well as an OpenSSL installation
tree.  Fortunately, it's easy to detect the difference; if it's a
build tree, there's a sub-directory 'apps'.

For installation trees, it's further complicated by OpenSSL's
'multilib' target attribute, which exists for platforms that support
directory separated libraries for differing bitness (typically 32-bit
and 64-bit libraries).  We trust pkg-config to give us the answer.
Binaries are easier, they live in $OPENSL_ROOT_DIR/bin.

Fixes #146

gost_pmeth.c: mitigate for constness difference in copy function

The second argument for the pkey_copy function has been constified in
OpenSSL to be 3.0.  This is normally not a problem, but when passing a
pointer to such a function, the compiler does complain.

This change solves the issue by looking at the macros
OPENSSL_VERSION_MAJOR, which is new in OpenSSL to be 3.0, and set
constness based on that.

Fixes #154

travis-ci: add linux-ppc64le build

Fix test_grasshopper and test_keyexpimp engine init

Try this approach:
https://stackoverflow.com/questions/32358197/travis-ci-install-perl-module-with-non-perl-language

Make proper engine initialization for tests instead of
EVP_add_cipher/EVP_add_digest hack. Fixes #151.

travis-ci: cleanup "so/dylib" mangling, not needed

after https://github.com/openssl/openssl/pull/8951

travis-ci: add osx builds

Fix MacOS building (master branch)

Fixes #122

Не учитывается значение carry

initial cirrus-ci support

test_tls: use socketpair instead of network connection

May fix build on Cirrus-CI, issue #134.

Fix compilation on FreeBSD

Otherwise `struct sockaddr_in` is undefined for test_tls.

Reported in #123 by f-andrey.

test_digest and alignment fix for Streebog