Update ignores for pmix/ext3x component

Signed-off-by: Ralph Castain <rhc@open-mpi.org>

.gitignore

@@ -336,6 +336,12 @@ opal/mca/pmix/pmix*/pmix/examples/pub
 opal/mca/pmix/pmix*/pmix/examples/server
 opal/mca/pmix/pmix*/pmix/examples/tool
 
+opal/mca/pmix/ext3x/ext3x.c
+opal/mca/pmix/ext3x/ext3x_client.c
+opal/mca/pmix/ext3x/ext3x_component.c
+opal/mca/pmix/ext3x/ext3x_server_north.c
+opal/mca/pmix/ext3x/ext3x_server_south.c
+
 opal/tools/opal-checkpoint/opal-checkpoint
 opal/tools/opal-checkpoint/opal-checkpoint.1
 opal/tools/opal-restart/opal-restart