Update processes.py example to work on windows.

The "Unable to run on windows" warning is actually about uname/ls, not
about gevent :)

examples/processes.py

@@ -5,24 +5,28 @@ from gevent import subprocess
 
 import sys
 
-if sys.platform.startswith("win"):
-    print("Unable to run on windows")
+if sys.platform.startswith('win'):
+    UNAME = ['cmd.exe', '/C', 'ver']
+    LS = ['dir.exe']
 else:
-    # run 2 jobs in parallel
-    p1 = subprocess.Popen(['uname'], stdout=subprocess.PIPE)
-    p2 = subprocess.Popen(['ls'], stdout=subprocess.PIPE)
+    UNAME = ['uname']
+    LS = ['ls']
 
-    gevent.wait([p1, p2], timeout=2)
+# run 2 jobs in parallel
+p1 = subprocess.Popen(UNAME, stdout=subprocess.PIPE)
+p2 = subprocess.Popen(LS, stdout=subprocess.PIPE)
 
-    # print the results (if available)
-    if p1.poll() is not None:
-        print('uname: %r' % p1.stdout.read())
-    else:
-        print('uname: job is still running')
-    if p2.poll() is not None:
-        print('ls: %r' % p2.stdout.read())
-    else:
-        print('ls: job is still running')
+gevent.wait([p1, p2], timeout=2)
 
-    p1.stdout.close()
-    p2.stdout.close()
+# print the results (if available)
+if p1.poll() is not None:
+    print('uname: %r' % p1.stdout.read())
+else:
+    print('uname: job is still running')
+if p2.poll() is not None:
+    print('ls: %r' % p2.stdout.read())
+else:
+    print('ls: job is still running')
+
+p1.stdout.close()
+p2.stdout.close()