testsuite: T13786 does not appear broken on linux with non-dynamic.

The referenced issue 20706 also doesn't list T13786 as a broken test.

Author: angerman

testsuite/tests/ghci/T13786/all.T

@@ -1,4 +1,4 @@
 test('T13786',
-     [when(unregisterised(), fragile(17018)), req_c, when(opsys('linux') and not ghc_dynamic(), expect_broken(20706))],
+     [when(unregisterised(), fragile(17018)), req_c],
      makefile_test, [])