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:set usage in ghci tests breaks platform independence of output

Numerous GHCi tests are currently failing on Windows due to the use of :set, which prints the default flag set, which is platform dependent. For instance:

--- "/tmp/ghctest-eo_ri0ye/test   spaces/./ghci/scripts/ghci024.run/ghci024.stdout.normalised"	2018-04-19 18:35:50.927278200 +0000
+++ "/tmp/ghctest-eo_ri0ye/test   spaces/./ghci/scripts/ghci024.run/ghci024.run.stdout.normalised"	2018-04-19 18:35:50.927278200 +0000
@@ -7,7 +7,6 @@
 GHCi-specific dynamic flag settings:
 other dynamic, non-language, flag settings:
   -fno-diagnostics-show-caret
-  -fexternal-dynamic-refs
   -fignore-optim-changes
   -fignore-hpc-changes
   -fno-ghci-history
Trac metadata
Trac field Value
Version 8.2.2
Type Bug
TypeOfFailure OtherFailure
Priority high
Resolution Unresolved
Component Test Suite
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
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