Issue #17047: remove doubled words found in 2.7 to 3.4 Lib/*,

as reported by Serhiy Storchaka and Matthew Barnett.

command/install.py

@@ -278,8 +278,8 @@ class install(Command):
 
         if self.user and (self.prefix or self.exec_prefix or self.home or
                 self.install_base or self.install_platbase):
-            raise DistutilsOptionError("can't combine user with with prefix/"
-                                       "exec_prefix/home or install_(plat)base")
+            raise DistutilsOptionError("can't combine user with prefix, "
+                                       "exec_prefix/home, or install_(plat)base")
 
         # Next, stuff that's wrong (or dubious) only on certain platforms.
         if os.name != "posix":

tests/test_install.py

@@ -165,7 +165,7 @@ class InstallTestCase(support.TempdirManager,
         cmd.home = 'home'
         self.assertRaises(DistutilsOptionError, cmd.finalize_options)
 
-        # can't combine user with with prefix/exec_prefix/home or
+        # can't combine user with prefix/exec_prefix/home or
         # install_(plat)base
         cmd.prefix = None
         cmd.user = 'user'