science/hypre: fix build on powerpc64*

Collision with machine/frame.h's lr:
In file included from /wrkdirs/usr/ports/science/hypre/work/hypre-2.23.0/src/distributed_ls/pilut/parilut.c:53:
In file included from /wrkdirs/usr/ports/science/hypre/work/hypre-2.23.0/src/distributed_ls/pilut/ilu.h:29:
In file included from /usr/include/signal.h:40:
In file included from /usr/include/sys/signal.h:48:
In file included from /usr/include/machine/signal.h:45:
/usr/include/machine/frame.h:54:13: error: expected ')'

register_t lr;