adding cygwin support

SConstruct

@@ -7,6 +7,11 @@ if sys.platform == 'linux2' or sys.platform == 'linux-i386':
     python_libpath = [sysconfig.get_python_lib (0, 1) + '/config']
     python_include = [sysconfig.get_python_inc ()]
     cppflags = '-fPIC'
+elif sys.platform == 'cygwin':
+    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']