Update libgee to 0.5.3.

pkgsrc changes:
* set LICENSE=gnu-lgpl-v2.1
* drop dependency on vala, not used.
* add TEST_TARGET.

NEWS from upstream:
libgee 0.5.3
============

 * Fix memory leaks in TimSort and LinkedList.
 * Bug fixes in TreeMap and TreeSet.

libgee 0.5.2
============

 * Build system enhancements to conform Gnome's style.
 * Bug fixes in TreeSet, TreeMap and Collection.to_array.
 * Deprecated Map methods marked with [Deprecated].

libgee 0.5.1
============

 * Bug fixes in HashMultiSet, TimSort, TreeMap, TreeMultiSet, and TreeSet.
 * Fix build with Vala 0.8.0 and later.
 * Fix build on Windows.
 * Fix subprocess handling in test infrastructure.

libgee 0.5.0
============

 * API changes
   * Introduce Functions hash, equal and compare function factory
   * Introduce Comparable<G> interface
   * Implementations provides sane defaults when constructed without functions
   * ReadOnly* made internal in favor of a `read_only_view` properties
   * Iterator<G> is now mutable and resettable
   * Introduction of BidirIterator<G> bidirectional iterators
   * List<G>.list_iterator () returns a specialized ListIterator<G>
   * Various API contracts clarifications and enhancements
   * Introduce List<G>.sort () with TimSort implementation
   * Complete Map API rework
   * Introduce Queue and Deque interfaces
   * Introduce MultiSet and MultiMap interfaces (Ali Sabil)
   * Introduce SortedSet interface (Maciej Pietchotka)

 * New implementations
   * HashMultiSet and HashMultiMap (Ali Sabil)
   * TreeMultiSet and TreeMultiMap.
   * PriorityQueue
   * LinkedList now implements Deque
   * TreeSet now implements SortedSet (Maciej Pietchotka)

 * Infrastructure
   * New test framework and complete tests refactoring (Julien Peters)
   * New doc/ documentation directory (--enable-doc)
   * Test coverage analysis using lcov (--enable-coverage)
   * Basic benchmark framework and sort benchmark (--enable-benchmark)
   * Use silent rules by default for users of automake 1.11

 * Code Quality
   * Many bug fixes
   * Many optimizations
   * Lots of additional documentation
   * Better overall encapsulation, dangerous public setters have been removed
   * Better test coverage (more than 90%)

libgee 0.4.0
============

 * Bug fixes.

libgee 0.3.0
============

 * Introduce AbstractCollection, AbstractList and AbstractMap base classes.
 * Add new properties and methods to Collection, List and Map. (Toma転 Vajngerl)
 * Add LinkedList implementation. (Mark Lee)
 * Add TreeSet and TreeMap implementations. (Maciej Piechotka)
 * Iterable.element_type is now a property.
 * Map.remove now takes an optional parameter to retrieve the removed value.
 * Bump library version info to reflect API/ABI breakage

libgee 0.2.0
============

 * Generate GIR file.

libgee 0.1.6
============

 * Fix build for Vala 0.7.
 * Bug fixes.


(obache)