Add patch I forgot to comit (#4103)

mingw-w64-python2-mysql/fix-mingw.patch

@@ -0,0 +1,11 @@
+--- MySQL-python-1.2.5/setup_windows.py.orig	2018-07-15 17:06:49.215182100 -0400
++++ MySQL-python-1.2.5/setup_windows.py	2018-07-15 17:15:06.862619600 -0400
+@@ -17,7 +17,7 @@ def get_config():
+     library_dirs = [ os.path.join(connector, r'lib\opt') ]
+     libraries = [ 'kernel32', 'advapi32', 'wsock32', client ]
+     include_dirs = [ os.path.join(connector, r'include') ]
+-    extra_compile_args = [ '/Zl' ]
++    extra_compile_args = [ '-Z' ]
+     
+     name = "MySQL-python"
+     if enabled(options, 'embedded'):