[MacPorts] #21410: sqlite3: add variant for r-tree indices.

[MacPorts]

#21410: sqlite3: add variant for r-tree indices.
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 Reporter:  wholzing@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement         |      Status:  new                                  
 Priority:  Normal              |   Milestone:                                       
Component:  ports               |     Version:  1.8.0                                
 Keywords:  sqlite3 rtree       |        Port:  sqlite3                              
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 R-tree indices, necessary for applications using spatial data, are
 supported by sqlite3, but not enabled in a default install.
 I added a variant to activate the r-tree module in sqlite3.
 Tested on my Macbook Pro running OS X 10.6.1 without problems.

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Ticket URL: <http://trac.macports.org/ticket/21410>
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