Fix SCons path issue on Windows.

intern/audaspace/SConscript

@@ -21,12 +21,14 @@
 #
 # ***** END LGPL LICENSE BLOCK *****
 
+from os import path
 Import ('env')
 
 sources = env.Glob('intern/*.cpp') + env.Glob('FX/*.cpp')
 
 # AUD_PyInit is for external audaspace only
-sources.remove('intern/AUD_PyInit.cpp')
+sources.remove(path.join('intern', 'AUD_PyInit.cpp'))
+
 
 incs = '. intern FX ' + env['BF_PTHREADS_INC'] + ' ' + env['BF_BOOST_INC']
 defs = []