Fix the "opt-win" build on Visual Studio 10.0

src/native_client/site_scons/site_tools/target_platform_windows.py

 #!/usr/bin/python2.4
 # Copyright 2009, Google Inc.
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
@@ skipping 386 matching lines @@
           '/MTd',    # link with LIBCMTD.LIB debug lib
       ],
       LINKFLAGS_DEBUG=['/DEBUG'],
 
       # Settings for optimized
       CCFLAGS_OPTIMIZED=[
           '/O1',     # optimize for size
           '/MT',     # link with LIBCMT.LIB (multi-threaded, static linked crt)
           '/GS',     # enable security checks
       ],
-      LINKFLAGS_OPTIMIZED=['/PDBPATH:none'],
+      # Omit the absolute pathname of the .pdb debugging info file
+      # from the executable, and just use a relative pathname.
+      LINKFLAGS_OPTIMIZED=['/PDBALTPATH:%_PDB%'],
 
       # Settings for component_builders
       COMPONENT_LIBRARY_LINK_SUFFIXES=['.lib'],
       COMPONENT_LIBRARY_DEBUG_SUFFIXES=['.pdb'],
   )
 
   # TODO: mslink.py creates a shlibLinkAction which doesn't specify
   # '$SHLINKCOMSTR' as its command string.  This breaks --brief.  For now,
   # hack into the existing action and override its command string.
   if env['PLATFORM'] != 'darwin':
     env['SHLINKCOM'].list[0].cmdstr = '$SHLINKCOMSTR'
 
   # Restore saved flags.
   env.Append(**saved)