For any test there's a directory with a script for each architecture.
These scripts generate intermediate files in the dir during compilation,
with the same names no matter the arch. So if one tries to execute the
scripts in parallel they all fight for the files.
To allow for parallel testing, now we create a temporal dir named after
the arch to isolate the intermediate files. Scripts are patched
accordingly.
This also allows easier clean-up: now, removing the temporal dirs is
almost all that we need (and the per-test .gitignore files are replaced
with a couple of lines in test/.gitignore). A common script replaces
the per-test cleanup.sh. It gets the number of the test as an argument
and takes care of some minor special cases. The makefile is adapted to
use this new test/cleanup_test.sh script.
Those special files are created during the last stage of each test, but
only if the host arch matches the test. They're _not_ isolated here
because it's harder (due to how we do the checksum) and they cannot
collide unless emulation is used and several calls to make are made at
the same time.
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