Logging that scripts aren't executable on Win32 if we can't figure

out how is good; telling people the most probable cause (ie. lack of
#! in a script) is even better.

PR:
Obtained from:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@81699 13f79535-47bb-0310-9956-ffa450edef68