[MacPorts] #43338: Update mongodb to 2.6.0

[MacPorts]

#43338: Update mongodb to 2.6.0
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  Reporter:  tspindler@…  |      Owner:  ryandesign@…
      Type:  update       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  mongodb      |
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Comment (by tspindler@…):

 I've attached a diff that builds 2.6.0 without any further patches. As
 I've never built mongodb before and also have no experience with
 Portfiles, handle with care.

 Changes were:
 o removed all patch file directives
 o changed version to 2.6.0
 o changed checksums
 o added --prefix=/opt/local to build.args
 o removed use of system wide libs boost, pcre and snappy, as they were not
 found by scons

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Ticket URL: <https://trac.macports.org/ticket/43338#comment:3>
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