[MacPorts] #61149: wkhtmltopdf: update to 0.12.6

[MacPorts]

#61149: wkhtmltopdf: update to 0.12.6
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 Reporter:  nickgaya  |      Owner:  (none)
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  wkhtmltopdf
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 Update wkhtmltopdf from 0.12.3.2 (Mar 1, 2016) to 0.12.6 (Jun 10, 2020).

 I was able to build and install 0.12.6 locally with only minor changes to
 the patchfiles, but the resulting wkhtmltopdf binary raised a segfault
 when tested against google.com.

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Ticket URL: <https://trac.macports.org/ticket/61149>
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