[MacPorts] #55100: meld @3.18.0 fails to build because itstool @2.0.3 failed with exit status 1

[MacPorts]

#55100: meld @3.18.0 fails to build because itstool @2.0.3 failed with exit status
1
------------------------+---------------------------
 Reporter:  ryandesign  |      Owner:  elelay
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  meld, itstool
------------------------+---------------------------
 meld fails to build (on 10.12 and 10.13, at least) because of itstool:

 https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/43466/steps
 /install-port/logs/stdio

 {{{
 msgfmt help/cs/cs.po -o build/help/cs/cs.mo
 itstool -m build/help/cs/cs.mo -o build/help/cs help/C/command-line.page
 error: command 'itstool' failed with exit status 1
 }}}

 meld builds fine on my 10.12 system, but I have lots of other ports
 installed. Could itstool or meld be missing a dependency?

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Ticket URL: <https://trac.macports.org/ticket/55100>
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