[test/spec-cpp] Try timeout of 10 seconds.

For some reason this task started hanging on both Github Actions and
sourcehut.  Logs aren't very useful.

It could be a recurrence of the issue related to #970.

- test/lint: Fix build.

core/pyos.py

@@ -24,6 +24,8 @@
   from core.comp_ui import _IDisplay
   from osh.builtin_process import _TrapHandler
 
+_ = log
+
 
 EOF_SENTINEL = 256  # bigger than any byte
 NEWLINE_CH = 10  # ord('\n')

test/spec-cpp.sh

@@ -67,7 +67,9 @@ run-with-osh-eval() {
   local base_dir=_tmp/spec/$SPEC_JOB
 
   # Run it with 3 versions of OSH.  And output TSV so we can compare the data.
+  # 2022-01: Try 10 second timeout.
   sh-spec spec/$test_name.test.sh \
+    --timeout 10 \
     --tsv-output $base_dir/${test_name}.tsv \
     $REPO_ROOT/bin/osh \
     $REPO_ROOT/bin/osh_eval \