tcg gawk hacks not idempotent

[caizixian]

It builds successfully the first time, but fails with the following during the second build.

WARNING: For repository 'com_google_googletest', the root module requires module version [email protected], but got [email protected] in the resolved dependency graph.
WARNING: For repository 'rules_proto', the root module requires module version [email protected], but got [email protected] in the resolved dependency graph.
ERROR: /tmp/mimalloc-bench/extern/tcg/tcmalloc/BUILD:116:11: //tcmalloc:tcmalloc_internal_methods_only: no such attribute 'linkshared' in 'cc_library' rule (did you mean 'linkstatic'?)
WARNING: Target pattern parsing failed.
ERROR: Skipping 'tcmalloc': Error evaluating 'tcmalloc': error loading package 'tcmalloc': Package 'tcmalloc' contains errors
ERROR: Error evaluating 'tcmalloc': error loading package 'tcmalloc': Package 'tcmalloc' contains errors
INFO: Elapsed time: 0.197s
INFO: 0 processes.
ERROR: Build did NOT complete successfully

[jvoisin]

My awk-fu is weak, so feel free to send a pull-request to fix this <3