Merge r536052, r556879, r557188 from trunk:

Add detection for post XP operating systems.
Think this can be safely backported to 2.2 and 2.0 branches

ApacheMonitor valid OS is any WIN32_NT version.

Simplify OS detection. We are only interested in NT
and WIN2K+ (so we can use services.msc)
Submitted by: mturk
Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@564552 13f79535-47bb-0310-9956-ffa450edef68