Python: do not use --unresolved-symbols= with Cray
Reported here: https://discourse.cmake.org/t/cmake-generates-compiler-options-not-supported/2391
This might be a Cray version thing. We might also need a different flag for Cray here. @jfavre Could you please test this fix (I'm assuming that the reporter there is you)?
Cc: @chuck.atkins @cory.quammen
Backport: paraview/release