SCons: Proper solution for local symbols map

Configuration used to override the link flags, it better restore them
once the configuration is done.

SConstruct

@@ -860,9 +860,11 @@ if B.targets != ['cudakernels']:
     from FindUnorderedMap import FindUnorderedMap
 
     conf = Configure(env)
+    old_linkflags = conf.env['LINKFLAGS']
     conf.env.Append(LINKFLAGS=env['PLATFORM_LINKFLAGS'])
     FindSharedPtr(conf)
     FindUnorderedMap(conf)
+    conf.env['LINKFLAGS'] = old_linkflags
     env = conf.Finish()
 
 # End of auto configuration

source/blender/makesdna/intern/SConscript

@@ -64,6 +64,7 @@ if sys.platform != 'cygwin':
 makesdna_tool.Append (CPPDEFINES = defines)
 makesdna_tool.Append( CFLAGS = env['CFLAGS'])
 makesdna_tool.Append( CCFLAGS = env['CCFLAGS'])
+makesdna_tool.Append( LINKFLAGS = env['PLATFORM_LINKFLAGS'])
 targetdir = normpath(root_build_dir+'/lib')
 
 if not (root_build_dir[0]==os.sep or root_build_dir[1]==':'):

source/blender/makesrna/intern/SConscript

@@ -191,6 +191,7 @@ makesrna_tool.Append (LIBPATH = libdir)
 
 makesrna_tool.Append( CFLAGS = env['CFLAGS'])
 makesrna_tool.Append( CCFLAGS = env['CCFLAGS'])
+makesrna_tool.Append( LINKFLAGS = env['PLATFORM_LINKFLAGS'])
 
 if env['BF_PROFILE']:
     makesrna_tool.Append (LINKFLAGS = env['BF_PROFILE_FLAGS'])