ENGINE_POLICY_SETAFFINITY for MPI binaries

* Also restore getopt -o option lost in some merge

examples/Makefile.am

@@ -54,10 +54,10 @@ swift_fixdt_LDADD =  ../src/.libs/libswiftsim.a $(HDF5_LDFLAGS) $(HDF5_LIBS)
 
 # Sources for swift_mpi, do we need an affinity policy for MPI?
 swift_mpi_SOURCES = main.c
-swift_mpi_CFLAGS = $(MYFLAGS) $(AM_CFLAGS) $(MPI_FLAGS) -DENGINE_POLICY="engine_policy_keep"
+swift_mpi_CFLAGS = $(MYFLAGS) $(AM_CFLAGS) $(MPI_FLAGS) -DENGINE_POLICY="engine_policy_keep $(ENGINE_POLICY_SETAFFINITY)"
 swift_mpi_LDADD =  ../src/.libs/libswiftsim_mpi.a $(HDF5_LDFLAGS) $(HDF5_LIBS) $(MPI_LIBS)
 
 swift_fixdt_mpi_SOURCES = main.c
-swift_fixdt_mpi_CFLAGS = $(MYFLAGS) $(AM_CFLAGS) $(MPI_FLAGS) -DENGINE_POLICY="engine_policy_fixdt | engine_policy_keep"
+swift_fixdt_mpi_CFLAGS = $(MYFLAGS) $(AM_CFLAGS) $(MPI_FLAGS) -DENGINE_POLICY="engine_policy_fixdt | engine_policy_keep $(ENGINE_POLICY_SETAFFINITY)"
 swift_fixdt_mpi_LDADD =  ../src/.libs/libswiftsim_mpi.a $(HDF5_LDFLAGS) $(HDF5_LIBS) $(MPI_LIBS)
 

examples/main.c

@@ -137,7 +137,7 @@ int main(int argc, char *argv[]) {
   bzero(&s, sizeof(struct space));
 
   /* Parse the options */
-  while ((c = getopt(argc, argv, "a:c:d:e:f:g:m:q:s:t:w:y:z:")) != -1)
+  while ((c = getopt(argc, argv, "a:c:d:e:f:g:m:oq:s:t:w:y:z:")) != -1)
     switch (c) {
       case 'a':
         if (sscanf(optarg, "%lf", &scaling) != 1)