openroad.bzl: Hack away prefix #870

Job	Run time
Smoketests	6m 0s
Generate configs	10s
Lint Bazel files	2s
//sram:top_mix_cts	3m 1s
Local flow - clean setup	7m 11s
open //sram:top_mix	2m 54s
tag_array_64x184_generate_abstract	3m 34s
open tag_array_64x184	2m 8s
tag_array_64x184_report	2m 15s
lb_32x128_generate_abstract	3m 45s
open L1MetadataArray	4m 8s
lb_32x128_test_generate_abstract	2m 13s
open subpackage:L1MetadataArray	4m 10s
L1MetadataArray_generate_abstract	5m 6s
open subpackage:tag_array_64x184	2m 8s
data_2048x8_generate_abstract	2m 14s
regfile_128x65_floorplan	2m 4s
subpackage:L1MetadataArray_generate_abstract	5m 5s
subpackage:tag_array_64x184_generate_abstract	2m 6s
Local flow - preinstalled orfs	7m 11s
	1h 7m 25s

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