[MacPorts] #65181: openjdk18-temurin can fail to parse depending on build_arch

[MacPorts]

#65181: openjdk18-temurin can fail to parse depending on build_arch
--------------------+-------------------------------
 Reporter:  jmroot  |      Owner:  breun
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  openjdk18-temurin
--------------------+-------------------------------
 {{{
 % port info openjdk18-temurin build_arch=i386
 Error: Unable to open port: can't read "version": no such variable
 }}}
 It's fine for the port to only be installable for certain archs, but the
 Portfile should parse validly regardless of what platform or arch it is
 read on.

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Ticket URL: <https://trac.macports.org/ticket/65181>
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