Remove the block on non-Windows, non-OS X platforms in setup.py.

This is in preparation for in-tree C modules, which will need to be
built via setup.py on all platforms.

src/setup.py

@@ -25,13 +25,11 @@
 from distutils.core import setup
 import sys, SceneFactory, Version, glob, os
 
-if os.name != 'nt' and sys.platform != 'darwin':
-  raise RuntimeError, 'This script is only meaningful for OS X and Windows.'
-
 
 # Start setting up py2{exe,app} and building the argument set for setup().
 # setup() arguments that are not specific to either are near the bottom of
 # the script, just before the actual call to setup().
+setup_args = {}
 if os.name == 'nt':
   import py2exe
   from py2exe.resources.VersionInfo import RT_VERSION
@@ -44,7 +42,7 @@ def isSystemDLL(pathname):
     return __orig_isSystemDLL(pathname)
   py2exe.build_exe.isSystemDLL = isSystemDLL
 
-  setup_args = {
+  setup_args.update({
     'zipfile': "data/library.zip",
     'windows': [
       {
@@ -64,10 +62,10 @@ def isSystemDLL(pathname):
         ).resource_bytes())]
       }
     ]
-  }
+  })
 elif sys.platform == 'darwin':
   import py2app
-  setup_args = {
+  setup_args.update({
     'app': ['FoFiX.py'],
     'data_files': [
       (".", ["../AUTHORS", "../COPYING", "../CREDITS", "../ChangeLog", "../Makefile", "../NEWS", "../README"]),
@@ -82,7 +80,7 @@ def isSystemDLL(pathname):
     'description': "Frets on Fire X",
     'name': "FoFiX",
     'url': "http://code.google.com/p/fofix/",
-  }
+  })
 
 
 # Forced includes needed for PIL.