practracker scans build directories inside the tor/ directory
When I run practracker after the failed "make distcheck" in legacy/trac#31577, I get these errors: ``` problem function-size /build-c/tor-0.4.2.0-alpha-dev/src/trunnel/socks5.c:socks4_client_request_encode() 352 problem function-size /build-c/tor-0.4.2.0-alpha-dev/src/trunnel/socks5.c:socks4_client_request_parse_into() 332 problem function-size /build-c/tor-0.4.2.0-alpha-dev/src/trunnel/socks5.c:socks5_client_request_encode() 113 problem function-size /build-c/tor-0.4.2.0-alpha-dev/src/trunnel/socks5.c:socks5_server_reply_encode() 113 problem file-size /build-c/tor-0.4.2.0-alpha-dev/src/trunnel/socks5.h 995 problem function-size /build-c/tor-0.4.2.0-alpha-dev/src/trunnel/hs/cell_introduce1.c:trn_cell_introduce_encrypted_encode() 110 (warning) problem file-size /src/core/or/circuitpadding.c 3096 (warning) problem function-size /src/core/or/circuitpadding.c:circpad_machine_schedule_padding() 113 (warning) problem file-size /src/core/or/circuitpadding.h 813 (warning) problem file-size /src/core/or/relay.c 3264 (warning) problem file-size /src/feature/hs/hs_service.c 4125 (warning) problem file-size /src/feature/nodelist/routerlist.c 3241 (warning) problem function-size /src/feature/rend/rendmid.c:rend_mid_establish_intro_legacy() 105 (warning) problem file-size /src/feature/rend/rendservice.c 4522 (warning) problem function-size /src/feature/rend/rendservice.c:rend_service_receive_introduction() 334 FAILURE: practracker found 482 new problem(s) in the code: see warnings above. Please fix the problems if you can, and update the exceptions file (../scripts/maint/practracker/./exceptions.txt) if you can't. See doc/HACKING/HelpfulTools.md for more information on using practracker. You can disable this message by setting the TOR_DISABLE_PRACTRACKER environment variable. make[1]: *** [check-best-practices] Error 226 make[1]: *** Waiting for unfinished jobs.... ```
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