WIP: temporally fix cmake issues with export tangets.

Older CMAKE versions wont work with export targets in different directories. For now we simply add the context_switcher manually to the export target of pls.
4 jobs from coninuation in 36 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #3512
build_cmake

00:19

 
  Test
failed #3513
run_tests

00:17

 
  Sanitizer
skipped #3515
run_address_sanitizer
skipped #3514
run_thread_sanitizer
 
Test run_tests
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