[MacPorts] #65806: istioctl @1.15.0: non-portable mktemp usage

[MacPorts]

#65806: istioctl @1.15.0: non-portable mktemp usage
------------------------+------------------------
 Reporter:  ryandesign  |      Owner:  nnikolay@…
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.7.2
 Keywords:  mavericks   |       Port:  istioctl
------------------------+------------------------
 https://build.macports.org/builders/ports-10.9_x86_64-builder/builds/199827/steps
 /install-port/logs/stdio
 {{{
 usage: mktemp [-d] [-q] [-t prefix] [-u] template ...
        mktemp [-d] [-q] [-u] -t prefix
 }}}
 The `mktemp` on old versions of macOS does not support whatever options
 this port's build system is using.

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Ticket URL: <https://trac.macports.org/ticket/65806>
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