core80: Fix configuration update and resurrect permissions.
buildsystem: Explicitely compile with -mtune=generic
gmp: fix build on Intel buildmachines.

on newer Intel buildsystems the gmp configure script enables some
sse2 optimizations that not work on old cpu's (ALIX, K6 ...)
Merge branch 'master' of ssh://git.ipfire.org/pub/git/ipfire-2.x
gmp: Ship MMX/SSE/SSE2 enabled version.
ddns: Update to version 003.