[MacPorts] #40057: mysqlxx: update to 3.2.0

[MacPorts]

#40057: mysqlxx: update to 3.2.0
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  Reporter:  kepeng@…  |      Owner:  kayos@…
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.2.0
Resolution:            |   Keywords:  haspatch
      Port:  mysqlxx   |
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Comment (by pixilla@…):

 Builds using patch-databases-mysqlxx-3.2.0-variants.diff​:
 {{{
 port -q installed mysqlxx
   mysqlxx @3.2.0_0+mariadb
   mysqlxx @3.2.0_0+mysql5
   mysqlxx @3.2.0_0+mysql51
   mysqlxx @3.2.0_0+mysql55
   mysqlxx @3.2.0_0+mysql56
   mysqlxx @3.2.0_0+percona (active)
 }}}

 This patch adds a test to require a variant is selected as I doubt mysqlxx
 can build without a mysql dependency.

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Ticket URL: <https://trac.macports.org/ticket/40057#comment:5>
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