bug#20814: cloog-0.18.0 build error

[Alírio Eyng]

commented on https://gnunet.org/bot/log/guix/2015-06-14#T678283
x86_64
7871724df7218428fac53133496c474bac8c5ea8 except for gettext downgraded
to 0.19.3 because
https://lists.gnu.org/archive/html/bug-gettext/2015-03/msg00005.html

cloog-0.18.0 includes modified isl-0.11.1 and upstream isl-0.11.1
works (dependency for cloog)

wwhhya4z2l180bjaqjdvs0rkvlhdri-cloog-0.18.0.drv line 1944 "error:
unknown type name ‘isl_constraint’" refers to something in these
files:
cloog-0.18.0/isl/isl_constraint_private.h
cloog-0.18.0/isl/include/isl/constraint.h
but they are not in the Makefile

wwhhya4z2l180bjaqjdvs0rkvlhdri-cloog-0.18.0.drv
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diffcloogisl
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Makefile
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