Help stabilising mini-gmp

[Torbjörn Granlund]

tg at gmplib.org (Torbjörn Granlund) writes:

  I realise that mini-gmp's requirement of GNU make hurts GMP's build
  environment compatibility testing; until now, we have tried to use plain
  'make' on almost all systems.  If mini-gmp now forces the entire build
  to use GNU make, then that's bad.

I rewrote parts of the testclient.sh script to accomodate this.

I also cleaned out the (finally more than 400) failures.  Not all were
due to the ABI clash, some were related to system make vs GNU make.

-- 
Torbjörn
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