Only try intel-specific tests on compatible CPUs.
Support <gmp.h> located in <gmp/gmp.h>.
Automatically set HAVE_NO_SSL_WHIRLPOOL if the lib lacks it.
Minor fix from Sparc/Solaris tests. The case of ntohll being undefined
should probably be fixed in some better way (handling BE). My problem
was that it already *was* properly defined beforehand.