openroad.bzl: Hack away prefix #871

Job	Run time
Generate configs	11s
Lint Bazel files	7s
Smoketests	5m 46s
//sram:top_mix_cts	3m 5s
open //sram:top_mix	3m 0s
Local flow - clean setup	7m 14s
tag_array_64x184_generate_abstract	3m 39s
open tag_array_64x184	2m 5s
tag_array_64x184_report	2m 17s
open L1MetadataArray	4m 9s
lb_32x128_generate_abstract	3m 47s
open subpackage:L1MetadataArray	4m 18s
lb_32x128_test_generate_abstract	2m 14s
open subpackage:tag_array_64x184	2m 9s
L1MetadataArray_generate_abstract	5m 9s
data_2048x8_generate_abstract	2m 11s
regfile_128x65_floorplan	2m 11s
subpackage:L1MetadataArray_generate_abstract	5m 11s
subpackage:tag_array_64x184_generate_abstract	2m 5s
Local flow - preinstalled orfs	7m 14s
	1h 8m 2s

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