local_admin_search_enum: Flimsy Windows version detection

[bcoles]

Untested, but based on code review, this is likely to fail:

metasploit-framework/modules/post/windows/gather/local_admin_search_enum.rb

Lines 78 to 79 in 7a49a91

	# If Vista/2008 or later add /R
	if (sysinfo['OS'] =~ /Build [6-9]\d\d\d/)

Same issue as #14309 in exploits/windows/local/s4u_persistence.rb :

metasploit-framework/modules/exploits/windows/local/s4u_persistence.rb

Lines 61 to 63 in 65fcf67

	if not (sysinfo['OS'] =~ /Build [6-9]\d\d\d/)
	fail_with(Failure::NoTarget, "This module only works on Vista/2008 and above")
	end

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I thought we'd standardized Windows version detection/comparison at some point. Someone [else] should review modules for version comparison and ensure this code pattern isn't used elsewhere.