add support to build in a seperate builddir like OpenELEC does per standard with the new packageformat. For this its needed to change @abs_top_srcdir@ (the sourcedir) to @abs_top_builddir@ (the real builddir) and changing all relative paths to absolute paths with help of $(srcdir) in includes.
Merge pull request #224 from sraue/builddirfix-Frodo

add support to build in a seperate builddir like OpenELEC does per stand...