libtss2-fapi library dependencies

[petrovr]

[[part1]]
LDFLAGS vs LIBADD . Part of build targets use LIBADD/LDADD another part LDFLAGS. Correct is LIBADD/LDADD. This is described in automake manual, chapter "Building a Shared Library".

Side effect - if is used LDFLAGS libtool may fail to add library from non-standard locations.
Remark: If I remember well libtool consider only order in LIBADD.

[[part2]]
libtss2-fapi depends from ssl library as well. Issue is same as tpm2-tools#453. Solution is to check for openssl.
Note that other build targets require only libcrypto.

[AndreasFuchsTPM]

Yes, please feel free to post a PR on this, if you have the time. :-)