Scons: Remove duplication of VALIDATOR_LIBS list and use library_deps.py instead

tests/custom_desc/nacl.scons

Index: tests/custom_desc/nacl.scons
diff --git a/tests/custom_desc/nacl.scons b/tests/custom_desc/nacl.scons
index a2a03d7f78ac10afb6326a52552534c0014688c5..24600d78e618bd6939814ab99e347801f0f2137c 100644
--- a/tests/custom_desc/nacl.scons
+++ b/tests/custom_desc/nacl.scons
@@ -12,12 +12,6 @@ trusted_env = env['TRUSTED_ENV']
 # This duplicates the library list in src/trusted/service_runtime/build.scons.
 # We would not have to do this if we could get Scons to track dependencies
 # between libraries.
-VALIDATOR_LIBS = []
-if trusted_env.Bit('target_x86'):
-  VALIDATOR_LIBS += [trusted_env.NaClTargetArchSuffix('ncvalidate')]
-elif trusted_env.Bit('target_arm'):
-  VALIDATOR_LIBS += ['ncvalidate_arm_v2']
-
 test_host = trusted_env.ComponentProgram(
     'desc_test_host', ['desc_test_host.c'],
     EXTRA_LIBS=['sel',
@@ -37,7 +31,7 @@ test_host = trusted_env.ComponentProgram(
                 'platform',
                 'platform_qual_lib',
                 'gio',
-                ] + VALIDATOR_LIBS)
+                ])
 
 test_guest = env.ComponentProgram(
     'desc_test_guest', ['desc_test_guest.c'],