add axllib tests to make check

some are broken, they should be fixed and added, as well
use peter's workaround for if4 test
fix dependencies for parallel build of test programs
enable now-working tests
don't use SUBDIRS for test programs
move Tests.am generation code out into testprog.am
correct XFAIL_TESTS for axldem
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.