32-bit linux.thread-reset, linux.clone-reset, api.startstop failing with usage error about vdso sysenter raw syscalls

https://github.com/DynamoRIO/dynamorio/runs/1534429151

```test 87
Start 87: code_api|linux.thread-reset

87: Test command: /home/runner/work/dynamorio/dynamorio/build_debug-internal-32/bin32/drrun "-s" "90" "-quiet" "-debug" "-killpg" "-stderr_mask" "0xC" "-dumpcore_mask" "0" "-enable_reset" "-reset_at_nth_thread" "2" "-code_api" "--" "/home/runner/work/dynamorio/dynamorio/build_debug-internal-32/suite/tests/bin/linux.thread"
87: Test timeout computed to be: 600
87: Sideline thread started
87:
87:
88/343 Test #87: code_api|linux.thread-reset ......................................***Failed Required regular expression not found. Regex=[^Sideline thread started
i = 2500000
i = 5000000
i = 7500000
i = 10000000
i = 12500000
i = 15000000
i = 17500000
i = 20000000
i = 22500000
i = 25000000
Sideline thread finished
Waiting for child to exit
Child has exited
$
] 0.26 sec
Sideline thread started

```