[PATCH] inform user if any postinstall script failed to run

[Jon TURNEY]

Here's a small patch for setup.exe which causes setup to indicate if a 
postinstall script didn't run successfully.

This should help avoid the situation where the postinstall scripts fail to run 
and the user has a broken installation, but they don't notice until they try 
to run something which relies on postinstall scripts, e.g [1] and I'm sure 
there are other examples.

[1] http://cygwin.com/ml/cygwin-xfree/2010-07/msg00084.html

ChangeLog:

	* postinstall.cc : Note if any postinstall script fails and tell
	the user with an error messagebox
	* script.cc (run): Don't rename script as .done if it didn't run
	successfully
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