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.
diff --git a/Lib/distutils/command/install.py b/Lib/distutils/command/install.py
index 2a18fb9..746ca1f 100644
--- a/Lib/distutils/command/install.py
+++ b/Lib/distutils/command/install.py
@@ -164,7 +164,7 @@
         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