autogen.sh: fix FTBS on out-of-tree build
Fix autogen.sh to support building in a separate directory.
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net
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Fix autogen.sh to support building in a separate directory.
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net