[CMake] Remove FindLibXlst.cmake

[CMake] Remove FindLibXlst.cmake
https://bugs.webkit.org/show_bug.cgi?id=68770

Patch by Raphael Kubo da Costa <kubo@profusion.mobi> on 2011-09-25
Reviewed by Adam Barth.

This file should have never been committed -- the library it looks for
is called libxslt, not libxlst, so it has never really been used. When
the buildsystem looked for libxslt, it used CMake's own LibXslt.cmake
instead.

* Source/cmake/FindLibXlst.cmake: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95921 268f45cc-cd09-0410-ab3c-d52691b4dbfc