cloog: new package

CLooG is a free software and library to generate code for scanning
Z-polyhedra.

cloog is needed for the optional graphite optimisations that are
supported by gcc since version 4.5. Therefore this package is required
for the toolchain to support graphite.

Graphite optimisations primarily involve loop blocking flattening and
interchage so are probably of mimimal use in an embedded system where
small sizes are favoured.

cloog depends on isl.

[Thomas:
 - Add patch to add missing CMake related files to the release
   tarball, preventing the build from succeeding.
 - bump to 0.18.2
 - disable libtool patch, which doesn't apply]

Signed-off-by: Steve Thomas <scjthm@live.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>