Non-SFI mode: Implement nacl_irt_random only for nacl_helper_nonsfi.

src/nonsfi/irt/build.scons

 # -*- python -*-
 # Copyright (c) 2014 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 Import('env')
 
 # This component implements NaCl IRT interfaces in terms of POSIX APIs.
 if not env.Bit('posix') and not env.Bit('nonsfi_nacl'):
   Return()
 
 # Since we are only targeting Unix, not Windows/MSVC, we can use C99
 # language features.
 env.FilterOut(CFLAGS='-Wdeclaration-after-statement')
 # Complaints about unused function arguments are too noisy.
 env.Append(CCFLAGS='-Wno-unused-parameter')
 # TODO(mseaborn): We can enforce -Wstrict-prototypes after the uses of
 # DEFINE_STUB/USE_STUB are gone.
 env.FilterOut(CFLAGS='-Wstrict-prototypes')
 
 irt_query_list_o = env.ComponentObject(
     'irt_query_list', ['$MAIN_DIR/src/untrusted/irt/irt_query_list.c'])
 env.ComponentLibrary('irt_nonsfi', ['irt_interfaces.c', irt_query_list_o])
+
+# For testing purposes, we split irt_random from libirt_nonsfi.a,
+# which will be linked into the random_test.
+env.ComponentLibrary('nacl_random_private', ['irt_random.c'])