gecode @3.7.3 New port

[brandon@…]

New Portfile for gecode, a C++ library described by the authors as "a toolkit for developing constraint-based systems and applications". It is a dependency of the dep_selector RubyGem being used by Opscode and others, and a way to install it via MacPorts would be nice.

Default variant has 1 dependency on boost. Port has 1 variant (+qt) that adds qt support and depends on qt4-mac.

[ryandesign (Ryan Carsten Schmidt)]

Thanks.

[ryandesign (Ryan Carsten Schmidt)]

Committed in r95786 with these changes:

• formatting changes
• use 7z distfile since it's 31% smaller
• add --disable-qt to ensure Qt support is not enabled unless qt variant is chosen
• it looked for the Graphviz program "dot" at configure time so I added --disable-doc-dot to ensure it doesn't get used, since no dependency on it is declared
• it wasn't actually using boost, until I added the --with-boost-include configure arg
• it doesn't link with any boost libraries so I changed boost to a build dependency
• fix livecheck