Skip writefile tests for quotes in filenames on Windows as quotes

are not supported on Windows

IPython/core/tests/test_magic.py

@@ -769,6 +769,7 b' def test_file():'
         nt.assert_in('line1\n', s)
         nt.assert_in('line2', s)
 
[e-mail]_win32
 def test_file_single_quote():
     """Basic %%writefile with embedded single quotes"""
     ip = get_ipython()
@@ -783,6 +784,7 b' def test_file_single_quote():'
         nt.assert_in('line1\n', s)
         nt.assert_in('line2', s)
 
[e-mail]_win32
 def test_file_double_quote():
     """Basic %%writefile with embedded double quotes"""
     ip = get_ipython()