test: skip postmortem metadata test when nm fails
On Windows with msys installation, nm
is available but
it is not able to grab symbols from the Windows build.
Skipping the test if nm outputs anything to stderr fixes that.
cc @cjihrig
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
test