Fixed a grab-bag of typos spotted by Rob Hooft.

Lib/distutils/command/bdist_rpm.py

@@ -400,7 +400,7 @@ class bdist_rpm (Command):
         ]
 
         for (rpm_opt, attr, default) in script_options:
-            # Insert contents of file refered to, if no file is refered to
+            # Insert contents of file referred to, if no file is refered to
             # use 'default' as contents of script
             val = getattr(self, attr)
             if val or default:

Lib/distutils/command/build_ext.py

@@ -394,7 +394,7 @@ class build_ext (Command):
             #     elegant, but people seem to expect it and I
             #     guess it's useful)
             # The environment variable should take precedence, and
-            # any sensible compiler will give precendence to later
+            # any sensible compiler will give precedence to later
             # command line args.  Hence we combine them in order:
             extra_args = ext.extra_compile_args or []
 

Lib/distutils/command/build_scripts.py

@@ -46,7 +46,7 @@ class build_scripts (Command):
         """Copy each script listed in 'self.scripts'; if it's marked as a
         Python script in the Unix way (first line matches 'first_line_re',
         ie. starts with "\#!" and contains "python"), then adjust the first
-        line to refer to the current Python intepreter as we copy.
+        line to refer to the current Python interpreter as we copy.
         """
         outfiles = []
         self.mkpath(self.build_dir)

Lib/distutils/command/install_data.py

@@ -18,7 +18,7 @@ class install_data (Command):
 
     user_options = [
         ('install-dir=', 'd',
-         "base directory for installating data files "
+         "base directory for installing data files "
          "(default: installation base dir)"),
         ('root=', None,
          "install everything relative to this alternate root directory"),