move ax0 tests to subdirs
use buildlib.mk for libax0 build
fix filter in buildlib.mk
ax0 doesn't do native code tests, only byte code

everything segfaults, so no tests are actually enabled
enable ax0 tests
disable pack0 and pack1 axllib tests

These tests fail on amd64 but pass on i386, which is a problem for
package building.
Merge branch 'master' into pab/devel