orfs_flow: support ADDITIONAL_LIBS/LEFS/GDS/FILES

[oharboe]

Doesn't work yet unless bazel run L1MetadataArray_1_floorplan_deps /tmp/foo is run first:

bazel run L1MetadataArray_1_floorplan /tmp/foo open_floorplan
INFO: Invocation ID: fdd7f97c-d361-4ec4-a8f1-de43c3bba8da
INFO: Analyzed target //:L1MetadataArray_1_floorplan (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
Target //:L1MetadataArray_1_floorplan up-to-date:
  bazel-bin/results/asap7/L1MetadataArray/1/2_floorplan.odb
  bazel-bin/results/asap7/L1MetadataArray/1/2_floorplan.sdc
  bazel-bin/reports/asap7/L1MetadataArray/1/2_floorplan_final.rpt
INFO: Elapsed time: 0.106s, Critical Path: 0.00s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action
INFO: Running command line: bazel-bin/L1MetadataArray_1_floorplan.sh /tmp/foo open_floorplan
ODB_FILE=.//results/asap7/L1MetadataArray/1/2_floorplan.odb external/_main~orfs_repositories~docker_orfs/OpenROAD-flow-scripts/tools/install/OpenROAD/bin/openroad -no_init -threads 12  external/_main~orfs_repositories~docker_orfs/OpenROAD-flow-scripts/flow/scripts/open.tcl
OpenROAD HEAD-HASH-NOTFOUND 
Features included (+) or not (-): +GPU +GUI +Python
This program is licensed under the BSD-3 license. See the LICENSE file for details.
Components of this program may be licensed under more restrictive licenses which must be honored.
[INFO ORD-0030] Using 12 thread(s).
Error: read_liberty.tcl, 25 cannot read file results/asap7/tag_array_64x184/base/tag_array_64x184.lib.
openroad>