Build and use libraries locally in the nacl build, not requiring "partial SDK"

src/untrusted/ehsupport/nacl.scons

Index: src/untrusted/ehsupport/nacl.scons
diff --git a/src/untrusted/ehsupport/nacl.scons b/src/untrusted/ehsupport/nacl.scons
index 282ba5ce33d3cea2dab87cfbaa2311ec1402c0ad..ab17f0c4e4eb705b52de7e7dcc8e166f836f7b1f 100644
--- a/src/untrusted/ehsupport/nacl.scons
+++ b/src/untrusted/ehsupport/nacl.scons
@@ -8,26 +8,13 @@ Import('env')
 if not env.Bit('bitcode'):
   Return()
 
-def GetPlatformSuffix(env):
-  platform = env.get('TARGET_FULLARCH')
-  assert platform in ['x86-32',  'x86-64', 'arm']
-  # we do not like hyphens in file names
-  return platform.replace('-', '_')
-
-platform = GetPlatformSuffix(env)
-
 # NOTE: we make sure everything in this directory gets compiled
 #       all the way down into native code.
 native_env = env.Clone()
-
-native_env.Replace(OBJSUFFIX='.o')
-native_env.Replace(SHLIBSUFFIX='.so')
+native_env.AddBiasForPNaCl()
+native_env.PNaClForceNative()
 native_env.Replace(LINK=native_env['C_ONLY_LINK'])
-native_env.Append(CCFLAGS=['-arch', '${TARGET_FULLARCH}',
-                      '--pnacl-allow-translate'])
-native_env.Append(LINKFLAGS=['-arch', '${TARGET_FULLARCH}',
-                             '--pnacl-allow-native',
-                             # TODO(pdox): This flag shouldn't be necessary,
+native_env.Append(LINKFLAGS=[# TODO(pdox): This flag shouldn't be necessary,
                              # the driver should be able to detect when there
                              # are no bitcode inputs.
                              '--pnacl-native-hack'])