run_tests: move selection of RefineOrphanage to run_tests

This is more consistent with how we handle other broken proof sessions
in the run_tests framework.

proof/ROOT

@@ -55,7 +55,7 @@ session Refine = BaseRefine +
  *)
 session RefineOrphanage = Refine +
   description {* Proof that the kernel does not orphan threads. *}
-  theories [condition = "L4V_ARCH_IS_ARM"]
+  theories
     "refine/$L4V_ARCH/Orphanage"
 
 session BaseRefine2 = BaseRefine +

run_tests

@@ -59,6 +59,7 @@ EXCLUDE["ARM_HYP"]=[
     "Access",
     "Bisim",
     "DRefine",
+    "RefineOrphanage",
     "SimplExportAndRefine"]
 
 EXCLUDE["ARM"]=[]
@@ -71,9 +72,11 @@ EXCLUDE["X64"]=[
     "CamkesGlueProofs",
     "DBaseRefine",
     "DSpec",
+    "RefineOrphanage",
     "SepTacticsExamples",
     "SimplExportAndRefine",
-    "AsmRefine"]
+    "AsmRefine"
+]
 
 EXCLUDE["RISCV64"]=[
     "AInvs",
@@ -84,6 +87,7 @@ EXCLUDE["RISCV64"]=[
     "CSpec",
     "CamkesDarpaReport",
     "CamkesGlueProofs",
+    "RefineOrphanage",
     "AsmRefine"
 ]