mknative-gmp for GMP 6.2.1 and most platforms.

re-run native-gmp for gmp 6.2.0 and arm: run with a v4 toolchain
instead of a v7 toolchain, so it works on all.

should fix latest build mess.

future: test the speed of this vs armv[567] specific o

re-run native-gmp for gmp 6.2.0 and arm: run with a v4 toolchain
instead of a v7 toolchain, so it works on all.

should fix latest build mess.

future: test the speed of this vs armv[567] specific on armv[567].

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mknative-gmp output for GMP 6.2.0.

updates for GMP 6.1.2 and most platforms. run tested on i386, amd64,
sparc sparc64, earm, ofppc and mips64eb. build tested on most.

remove the earm* variants as they're now the same as the arm* on

updates for GMP 6.1.2 and most platforms. run tested on i386, amd64,
sparc sparc64, earm, ofppc and mips64eb. build tested on most.

remove the earm* variants as they're now the same as the arm* ones.

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clean up __GMP_CC, GMP_MPARAM_H_SUGGEST and CONFIG_TOP_SRCDIR.

GMP 5.1.3 updates for armeb and earm.

remove references to my src/obj trees, and make a note about avoiding
this in the future / should automate it too.

- add support for building GMP for powerpc, sparc, arm and armeb.
- XXX armeb files modified from arm, not based upon generated ones.