Test suite failure: Handle no DWARF information

[pipcet]

regexp "^.*/dwarf3\.o: In function `main':$"
line   "tmpdir/dwarf3.o: In function `__wasm_code_main':"
regexp_diff match failure
regexp "^.*\(\.text.*\+0x[0-9a-f]+\): undefined reference to `bar'$"
line   "(.wasm.payload.code+0x56): undefined reference to `bar'"
regexp_diff match failure
regexp "^.*\(\.text.*\+0x[0-9a-f]+\): undefined reference to `bar'$"
line   "(.wasm.payload.code+0x83): undefined reference to `bar'"

Harmless, but annoying to xfail.