Revert part of previous patch: several install_* subcommands expect

    .compile to be None, and set it to true if it is.
    Caught by Pearu Peterson.

Bugfix candidate, if the previous change is accepted for
release22-maint.

Lib/distutils/command/install.py

@@ -164,7 +164,7 @@ class install (Command):
         self.install_scripts = None
         self.install_data = None
 
-        self.compile = 0
+        self.compile = None
         self.optimize = None
 
         # These two are for putting non-packagized distributions into their