PNaCl driver: Add libgcc to mixed native/bitcode links

pnacl/driver/driver_env.py

 #!/usr/bin/python
 # Copyright (c) 2012 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.
 #
 # IMPORTANT NOTE: If you make local mods to this file, you must run:
 #   %  pnacl/build.sh driver
 # in order for them to take effect in the scons build.  This command
 # updates the copy in the toolchain/ tree.
 
@@ skipping 32 matching lines @@
   'BASE_LIB'        : '${BASE}/lib',
   'BASE_USR_ARCH'   : '${BASE_USR_%BCLIB_ARCH%}',
   'BASE_USR_X8632'  : '${BASE}/usr-bc-x86-32',
   'BASE_USR_X8664'  : '${BASE}/usr-bc-x86-64',
   'BASE_USR_ARM'    : '${BASE}/usr-bc-arm',
   'BASE_LIB_ARCH'   : '${BASE_LIB_%BCLIB_ARCH%}',
   'BASE_LIB_X8632'  : '${BASE}/lib-bc-x86-32',
   'BASE_LIB_X8664'  : '${BASE}/lib-bc-x86-64',
   'BASE_LIB_ARM'    : '${BASE}/lib-bc-arm',
 
+  'LIBS_NATIVE_ARCH' : '${LIBS_NATIVE_%ARCH%}',
+  'LIBS_NATIVE_ARM' : '${BASE_LIB_NATIVE}arm',
+  'LIBS_NATIVE_ARM_NONSFI' : '${BASE_LIB_NATIVE}arm-nonsfi',
+  'LIBS_NATIVE_X8632' : '${BASE_LIB_NATIVE}x86-32',
+  'LIBS_NATIVE_X8632_NONSFI' : '${BASE_LIB_NATIVE}x86-32-nonsfi',
+  'LIBS_NATIVE_X8664' : '${BASE_LIB_NATIVE}x86-64',
+  'LIBS_NATIVE_MIPS32' : '${BASE_LIB_NATIVE}mips32',
+
   'BASE_LLVM_BIN'   : '${BASE_LLVM}/bin',
   'TRANSLATOR_BIN'  :
     '${BASE_TOOLCHAIN}/pnacl_translator/${STANDARD_ARCH}/bin',
 
   # TODO(pdox): Unify this with ARCH.
   'STANDARD_ARCH'       : '${STANDARD_ARCH_%ARCH%}',
   'STANDARD_ARCH_X8632' : 'i686',
   'STANDARD_ARCH_X8664' : 'x86_64',
   'STANDARD_ARCH_ARM'   : 'armv7',
   'STANDARD_ARCH_MIPS32': 'mips32',
@@ skipping 440 matching lines @@
 
 
 env = Environment()
 
 def override_env(meth_name, func):
   """Override a method in the global |env|, given the method name
   and the new function.
   """
   global env
   setattr(env, meth_name, types.MethodType(func, env, Environment))