Added SCons support for building niflib.

SConstruct

+import sys
+import os
+from distutils import sysconfig
+
+if sys.platform == 'linux2' or sys.platform == 'linux-i386':
+    python_lib = ['python%d.%d' % sys.version_info[0:2]]
+    python_libpath = [sysconfig.get_python_lib (0, 1) + '/config']
+    python_include = [sysconfig.get_python_inc ()]
+    cppflags = ''
+elif sys.platform == 'win32':
+    python_include = [sysconfig.get_python_inc()]
+    python_libpath = [sysconfig.get_python_lib(1, 1) + '/../libs']
+    python_lib = ['python24']
+    cppflags = '/EHsc'
+else:
+    print "platform %s not supported"%sys.platform
+
+env = Environment(ENV = os.environ)
+
+env.StaticLibrary('niflib', Split('niflib.cpp nif_math.cpp NIF_Blocks.cpp NIF_IO.cpp docsys_extract.cpp'), CPPPATH = '.', CPPFLAGS = cppflags)
+env.SharedLibrary('_niflib', 'pyniflib.i', LIBS=['niflib'] + python_lib, LIBPATH=['.'] + python_libpath, SWIGFLAGS = '-c++ -python', CPPPATH = ['.'] + python_include, CPPFLAGS = cppflags)