orfs_flow: support ADDITIONAL_LIBS/LEFS/GDS/FILES #972

Job	Run time
Generate configs	10s
Smoketests	9m 5s
//sram:top_mix_cts	3m 12s
Lint Bazel files	6s
open //sram:top_mix	3m 24s
tag_array_64x184_generate_abstract	3m 23s
Local flow - clean setup	5m 20s
tag_array_64x184_report	2m 21s
open tag_array_64x184	2m 5s
open L1MetadataArray	3m 36s
lb_32x128_generate_abstract	3m 44s
open subpackage:L1MetadataArray	3m 38s
lb_32x128_test_generate_abstract	2m 13s
open subpackage:tag_array_64x184	2m 23s
L1MetadataArray_generate_abstract	3m 58s
data_2048x8_generate_abstract	2m 18s
regfile_128x65_floorplan	2m 16s
subpackage:L1MetadataArray_generate_abstract	4m 10s
subpackage:tag_array_64x184_generate_abstract	2m 5s
Local flow - preinstalled orfs	5m 28s
	1h 4m 55s

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