[Ecls-list] Latest changes

[Juan Jose Garcia-Ripoll]

* The version 6.1 of the Boehm-Weiser GC has been imported.

* Some statements of the form "#endif some_word_here" have been fixed, because 
most modern compilers complain about them.

* The headers of the garbage collector are installed together with those from 
ECL, so that users writing extensions for ECL may benefit from them.

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