TH test failures with -fexternal-interpreter

These TH tests are currently failing with -fexternal-interpreter. I need to fix these before I can enable testing of all TH tests with -fexternal-interpreter.

Unexpected failures:
   T10697_decided_1.run  T10697_decided_1 [exit code non-0] (ext-interp)
   T10697_decided_2.run  T10697_decided_2 [exit code non-0] (ext-interp)
   T10697_decided_3.run  T10697_decided_3 [exit code non-0] (ext-interp)
   T8761.run             T8761 [stderr mismatch] (ext-interp)

Trac metadata

Trac field	Value
Version	8.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	high
Resolution	Unresolved
Component	Compiler
Test case
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TH test failures with -fexternal-interpreter