build: Replace lingering instances of Options.platform

contrib/wscript

@@ -233,7 +233,7 @@ def ns3_python_bindings(bld):
             pymod.env.append_value('LINKFLAGS', '-Wl,-Bdynamic,--no-whole-archive')
     defines = list(pymod.env['DEFINES'])
     defines.extend(['NS_DEPRECATED=', 'NS3_DEPRECATED_H'])
-    if Options.platform == 'win32':
+    if Utils.unversioned_sys_platform() == 'win32':
         try:
             defines.remove('_DEBUG') # causes undefined symbols on win32
         except ValueError:

src/internet/wscript

@@ -67,7 +67,7 @@ def configure(conf):
                                      "NSC not found (see option --with-nsc)")
         return
     
-    if Options.platform in ['linux', 'freebsd']:
+    if Utils.unversioned_sys_platform() in ['linux', 'freebsd']:
         arch = os.uname()[4]
     else:
         arch = None

wscript

@@ -423,7 +423,7 @@ def configure(conf):
 
     # bug 2181 on clang warning suppressions
     if conf.env['CXX_NAME'] in ['clang']:
-        if Options.platform == 'darwin':
+        if Utils.unversioned_sys_platform() == 'darwin':
             if conf.env['CC_VERSION'] >= darwin_clang_version_warn_unused_local_typedefs:
                 env.append_value('CXXFLAGS', '-Wno-unused-local-typedefs')
             if conf.env['CC_VERSION'] >= darwin_clang_version_warn_potentially_evaluated: 
@@ -435,7 +435,7 @@ def configure(conf):
                 env.append_value('CXXFLAGS', '-Wno-potentially-evaluated-expression')
     env['ENABLE_STATIC_NS3'] = False
     if Options.options.enable_static:
-        if Options.platform == 'darwin':
+        if Utils.unversioned_sys_platform() == 'darwin':
             if conf.check_compilation_flag(flag=[], linkflags=['-Wl,-all_load']):
                 conf.report_optional_feature("static", "Static build", True, '')
                 env['ENABLE_STATIC_NS3'] = True