[MacPorts] #39012: pficommon: add database variants

[MacPorts]

#39012: pficommon: add database variants
--------------------------+-----------------------
 Reporter:  ryandesign@…  |      Owner:  hum@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  pficommon
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 pficommon currently has these variants:

 {{{
 pficommon has the variants:
    fcgi: Enable FastCGI module
    magickpp: Enable Magick++ of ImageMagick module
 [+]mprpc: Enable MessagePack RPC module
    mysql: Obsolete compatibility variant
      * requires mysql5
    mysql5: Enable MySQL 5
    postgresql: Obsolete compatibility variant
      * requires postgresql91
    postgresql84: Enable PostgreSQL 8.4
      * conflicts with postgresql90 postgresql91
    postgresql90: Enable PostgreSQL 9.0
      * conflicts with postgresql84 postgresql91
    postgresql91: Enable PostgreSQL 9.1
      * conflicts with postgresql84 postgresql90
    universal: Build for multiple architectures
 }}}

 Could you please add variants for postgresql92 (conflicts with other
 postgresql variants) and mysql51, mysql55, mariadb and percona (conflict
 with mysql5 variant)?

 The old "mysql" and "postgresql" variants can be removed; they've been
 "obsolete compatibility variants" for 18 months.

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Ticket URL: <https://trac.macports.org/ticket/39012>
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