PNaCl driver: Add libgcc to mixed native/bitcode links

pnacl/driver/nativeld.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.
 #
 #
 # This is a thin wrapper for native LD. This is not meant to be
 # used by the user, but is called from pnacl-translate.
 # This implements the native linking part of translation.
 #
@@ skipping 37 matching lines @@
                   # Only relevant for ARM where it suppresses a warning.
                   # Ignored for other archs.
                   '--no-fix-cortex-a8 ' +
                   '--eh-frame-hdr ' +
                   # Give an error if any TEXTRELs occur.
                   '-z text ' +
                   '--build-id ',
 
   'SEARCH_DIRS'        : '${SEARCH_DIRS_USER} ${SEARCH_DIRS_BUILTIN}',
   'SEARCH_DIRS_USER'   : '',
-  'SEARCH_DIRS_BUILTIN': '${USE_STDLIB ? ${LIBS_ARCH}/}',
-
-  'LIBS_ARCH'        : '${LIBS_%ARCH%}',
-  'LIBS_ARM'         : '${BASE_LIB_NATIVE}arm',
-  'LIBS_ARM_NONSFI'  : '${BASE_LIB_NATIVE}arm-nonsfi',
-  'LIBS_X8632'       : '${BASE_LIB_NATIVE}x86-32',
-  'LIBS_X8632_NONSFI': '${BASE_LIB_NATIVE}x86-32-nonsfi',
-  'LIBS_X8664'       : '${BASE_LIB_NATIVE}x86-64',
-  'LIBS_MIPS32'      : '${BASE_LIB_NATIVE}mips32',
+  'SEARCH_DIRS_BUILTIN': '${USE_STDLIB ? ${LIBS_NATIVE_ARCH}/}',
 
   # Note: this is only used in the unsandboxed case
   'RUN_LD' : '${LD} ${LD_FLAGS} ${inputs} -o ${output}'
 }
 
 def PassThrough(*args):
   env.append('LD_FLAGS', *args)
 
 LDPatterns = [
   ( '-o(.+)',          "env.set('OUTPUT', pathtools.normalize($0))"),
@@ skipping 184 matching lines @@
 def LinkerFiles(args):
   ret = []
   for f in args:
     if IsFlag(f):
       continue
     else:
       if not pathtools.exists(f):
         Log.Fatal("Unable to open '%s'", pathtools.touser(f))
       ret.append(f)
   return ret