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After all .fex files can be successfully compiled, let's also
test the opposite direction by decompiling the resulting .bin.
The output then has to pass an automated diff against the source
.fex (transformed via some preprocessing with "unify-fex").
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

All tests should go into the new "tests" subdirectory. The idea is
that the separate Makefile in that directory will get invoked via
a top-level "make check".

The tests/Makefile should then take care of running all available
tests, returning an appropriate exit status. Future tests may be
functional, examine code metrics (coverage analysis), or both.

For a start, I'd simply like to check that sunxi-fexc is able to
properly compile all the .fex files from linux-sunxi/sunxi-boards.

(Note: This currently FAILS and will probably require adjustments
to both sunxi-tools and the .fex repository. To work around this,
for now I'm applying patches to fix sunxi-boards.)
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>