Revert "[mlir:JitRunner] Use custom shared library init/destroy functions if available"
This reverts commit 84dc9b451bfd62474f44dd1af0e4955a0110d523.
Fix Windows breakage: http://lab.llvm.org:8011/#/builders/13/builds/3658/steps/6/logs/stdio
Differential Revision: https://reviews.llvm.org/D94309