Tests fail with quick build due -fghci-check-leak

E.g.

*** unexpected failure for break026(ghci)
Actual stdout output differs from expected:
--- "/tmp/ghctest-h_5vired/test   spaces/testsuite/tests/ghci.debugger/scripts/T1620.run/T1620.stdout.normalised"	2021-02-12 20:09:18.727025911 +0200
+++ "/tmp/ghctest-h_5vired/test   spaces/testsuite/tests/ghci.debugger/scripts/T1620.run/T1620.run.stdout.normalised"	2021-02-12 20:09:18.727025911 +0200
@@ -4,6 +4,10 @@
 No modules are loaded with debugging support.
 No active breakpoints.
 [1,3,4,7,10]
+-fghci-leak-check: HomeModInfo for Main is still alive at 0x00000042009134e8
+-fghci-leak-check: ModIface is still alive at 0x00000042009f0450
+-fghci-leak-check: ModDetails is still alive at 0x00000042009f0518
+-fghci-leak-check: Linkable is still alive at 0x00000042009f89e8

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