These are a bunch of intertwined changes to the windows build.

These are a bunch of intertwined changes to the windows build.
This log message includes all of the different changes across several
Makefile.in files (and win-pre.in and win-post.in):

- Remove "-" from recursive windows make invocations so that we can bail
  on a build error.  New MIGNORE option restores the previous bailing
  behavior.
- Update windows readme to reflect current practices.
- Add NO_OUTDIR synonym for NO_OUTPRE in windows build.
- Top-level windows Makefile now builds util which now builds
  util/windows, util/et, and util/profile (instead of building them
  directly).
- Remove trailing backslash from rule that creates the windows output dir.
  This backslash would cause the rule to always be invoked.
- Move WCONFIG and WCONFIG_EXE definitions into win-pre.in.
- Remove rules in include directory that blindly copy include header
  files from gssapi, et, and profile.  Instead, use/add build rules to
  the components that generate them that copy only when the file changes.
- Use dependencies in include/krb5 to copy header files instead of blindly
  copying them.  Add !if 0/!endif wrapper to Unix version of the rules.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@11464 dc483132-0cff-0310-8789-dd5450dbe970