0.4.7.2-alpha FTBFS on i386

The 0.4.7.2-alpha debian experimental release build has failed on all suites on i386: https://jenkins.torproject.org/job/tor-debian-release-binaries/191/

The builds appear to fail at the testsuite stage.

e.g. https://jenkins.torproject.org/job/tor-debian-release-binaries/191/ARCHITECTURE=i386,SUITE=bullseye/console

18:44:01 sandbox/chown_filename: [forking] 
18:44:02   FAIL ../src/test/test_sandbox.c:202: chown: Operation not permitted [1]
18:44:02   [chown_filename FAILED]
18:44:02 sandbox/rename_filename: [forking] OK
18:44:02 sandbox/stat_filename: [forking] 
18:44:02   FAIL ../src/test/test_sandbox.c:288: assert(rc OP_EQ -1): 0 vs -1
18:44:02   [stat_filename FAILED]

or https://jenkins.torproject.org/job/tor-debian-release-binaries/191/ARCHITECTURE=i386,SUITE=stretch/console

18:37:05 sandbox/chown_filename: [forking] 
18:37:05   FAIL ../src/test/test_sandbox.c:202: chown: Operation not permitted [1]
18:37:05   [chown_filename FAILED]