(svn r8143) Remove the landscaping button from the build toolbars.
The landscaping toolbar can be reached at least as easy directly from the main toolbar.
Further two of the four toolbars uses 'l' as keyboard shortcut for this button, which plain does not work (The letter has to be uppercase).
This was covered by the fact there is a global shortcut 'L' to open the landscaping toolbar, so the individual checks in the four build toolbars were redundant anyway.

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