[MacPorts] #70464: claws-mail, nmap, and ncarg have bad OS version conditionals

[MacPorts]

#70464: claws-mail, nmap, and ncarg have bad OS version conditionals
-----------------------+-------------------------------------
 Reporter:  fhgwright  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.9.3
 Keywords:             |       Port:  claws-mail, nmap, ncarg
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 I stumbled across this:
 {{{
 MacPro:macports-ports fw$ git grep -n '${os.version} *[<>=]'
 mail/claws-mail/Portfile:58:if {${os.platform} eq "darwin" &&
 ${os.version} < 12} {
 net/nmap/Portfile:58:if {${os.platform} eq "darwin" && ${os.version} < 13}
 {
 science/ncarg/Portfile:171:        if {${os.version}>=12} {
 }}}

 In each case, `${os.version}` should almost certainly be `${os.major}`.
 As it is, 10.4 and 10.5 (darwin 8 and 9) are treated as the most recent
 systems.

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Ticket URL: <https://trac.macports.org/ticket/70464>
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