Packaging: remove last mentions and uses of setup.py in the code.

Now only the compatibility layer (in create, util and install) talk
about setup.py.
diff --git a/Lib/packaging/compiler/msvc9compiler.py b/Lib/packaging/compiler/msvc9compiler.py
index 43fc5fa..6ca49c2 100644
--- a/Lib/packaging/compiler/msvc9compiler.py
+++ b/Lib/packaging/compiler/msvc9compiler.py
@@ -130,10 +130,10 @@
                 raise KeyError("sdkinstallrootv2.0")
         except KeyError:
             raise PackagingPlatformError(
-            """Python was built with Visual Studio 2008;
-extensions must be built with a compiler than can generate compatible binaries.
-Visual Studio 2008 was not found on this system. If you have Cygwin installed,
-you can try compiling with MingW32, by passing "-c mingw32" to setup.py.""")
+"""Python was built with Visual Studio 2008; extensions must be built with a
+compiler than can generate compatible binaries. Visual Studio 2008 was not
+found on this system. If you have Cygwin installed, you can try compiling
+with MingW32, by passing "-c mingw32" to pysetup.""")
 
         if version >= 9.0:
             self.set_macro("FrameworkVersion", self.vsbase, "clr version")
diff --git a/Lib/packaging/compiler/msvccompiler.py b/Lib/packaging/compiler/msvccompiler.py
index 97f76bb..3d4ac3c 100644
--- a/Lib/packaging/compiler/msvccompiler.py
+++ b/Lib/packaging/compiler/msvccompiler.py
@@ -134,8 +134,7 @@
 """Python was built with Visual Studio 2003; extensions must be built with
 a compiler than can generate compatible binaries. Visual Studio 2003 was
 not found on this system. If you have Cygwin installed, you can try
-compiling with MingW32, by passing "-c mingw32" to setup.py.""")
-# XXX update this comment for setup.cfg
+compiling with MingW32, by passing "-c mingw32" to pysetup.""")
 
         p = r"Software\Microsoft\NET Framework Setup\Product"
         for base in HKEYS:
diff --git a/Lib/packaging/compiler/unixccompiler.py b/Lib/packaging/compiler/unixccompiler.py
index 8c24c0f..c857d03 100644
--- a/Lib/packaging/compiler/unixccompiler.py
+++ b/Lib/packaging/compiler/unixccompiler.py
@@ -33,7 +33,7 @@
 #     we need some way for outsiders to feed preprocessor/compiler/linker
 #     flags in to us -- eg. a sysadmin might want to mandate certain flags
 #     via a site config file, or a user might want to set something for
-#     compiling this module distribution only via the setup.py command
+#     compiling this module distribution only via the pysetup command
 #     line, whatever.  As long as these options come from something on the
 #     current system, they can be as system-dependent as they like, and we
 #     should just happily stuff them into the preprocessor/compiler/linker