[MacPorts] #57257: gr-iio needs a dependency on libad9361-iio maybe?

[MacPorts]

#57257: gr-iio needs a dependency on libad9361-iio maybe?
------------------------+-----------------------
 Reporter:  ryandesign  |      Owner:  michaelld
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  gr-iio
------------------------+-----------------------
 https://build.macports.org/builders/ports-10.13_x86_64-builder/builds/35871/steps
 /install-port/logs/stdio

 {{{
 CMake Error: The following variables are used in this project, but they
 are set to NOTFOUND.
 Please set them or make sure they are set and tested correctly in the
 CMake files:
 AD9361_INCLUDE_DIRS
 }}}

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Ticket URL: <https://trac.macports.org/ticket/57257>
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