Update supporting files for components which rely on autoconf to allow systems
introducing since release of software to be recognised. This should hopefully
allow the builds to progress a littles fur

Update supporting files for components which rely on autoconf to allow systems
introducing since release of software to be recognised. This should hopefully
allow the builds to progress a littles further on systems such as the POWER8
which features a little endian 64-bit PowerPC CPU identified as ppc64le.

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Overhaul build infrastructure:
- use automake to generate the Makefile.in
- style reorg in configure.ac
- ensure <openssl/sha.h> provides SHA256_CTX (openssl 0.9.8 or greater)
- move the "build helpe

Overhaul build infrastructure:
- use automake to generate the Makefile.in
- style reorg in configure.ac
- ensure <openssl/sha.h> provides SHA256_CTX (openssl 0.9.8 or greater)
- move the "build helpers" to buildaux
- add a rudimentary (and not yet functional) test suite

(There's still more to do.)

Per chat with Alistair.

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