[MIPS] Add remaining parts for building tests for MIPS

tests/sel_ldr/nacl.scons

Index: tests/sel_ldr/nacl.scons
diff --git a/tests/sel_ldr/nacl.scons b/tests/sel_ldr/nacl.scons
index 96be59ff68b4c419a3e5c97697f816f9b2718d78..7b3d46ec01b3ea403adfd3bdd9efb1d4f424b4c3 100644
--- a/tests/sel_ldr/nacl.scons
+++ b/tests/sel_ldr/nacl.scons
@@ -16,9 +16,14 @@ node = env.SelUniversalTest(
                          '--command_file',
                          env.File('hard_shutdown_test.stdin')],
     )
+
+# TODO(petarj): The tests hangs indefinite on QEMU MIPS. Enable it when fixed.
+is_broken=env.Bit('target_mips32') and env.UsingEmulator()
+
 env.AddNodeToTestSuite(node,
                        ['small_tests'],
-                       'run_hard_shutdown_test')
+                       'run_hard_shutdown_test',
+                       is_broken=is_broken)
 
 node = env.SelUniversalTest(
     'force_shutdown_test.out',
@@ -30,4 +35,5 @@ node = env.SelUniversalTest(
     )
 env.AddNodeToTestSuite(node,
                        ['small_tests'],
-                       'run_force_shutdown_test')
+                       'run_force_shutdown_test',
+                       is_broken=is_broken)