[Lightning] Test case for `ldxi' with big displacement

[Ludovic Courtès]

Hi,

Lightning 1.2 does not correctly handle `ldxi' with big displacements on
PPC.  After tracking the bug, I re-discovered that you had already fixed
it in your branch (patch-19).  Anyway, I wrote a test case which you can
fetch from my Arch branch (patch-7) if it's useful.

Also, I slightly modified `tests/Makefile.am' (in patch-6) so that the
CPPFLAGS are actually honored.  Currently, `AM_CPPFLAGS' is not honored
when test programs are compiled in a single phase (i.e., without going
through a `-c' phase first); thus, test programs end up using the
already-installed headers rather than the ones in `$(srcdir)'.  The work
around consists in `AM_LDFLAGS = $(AM_CPPFLAGS)'.

Soon time for a bugfix release?  :-)

Thanks,
Ludovic.