Fixes <https://bugs.gnu.org/45252>.
* gnu/packages/patches/libffi-float128-powerpc64le.patch: Import patch file
from <https://github.com/libffi/libffi/pull/561.patch>.
* gnu/packages/libffi.scm (libffi)[arguments]: Apply patch conditionally for
powerpc64le-* systems in a phase.
[inputs]: Add patch as input conditionally for powerpc64le-* systems.
* gnu/local.mk (dist_patch_DATA): Add patch file to build system.
Signed-off-by: Chris Marusich <cmmarusich@gmail.com>
