build: Always have 'BUILD_DIR' variable pointing to the root of the build tree
Signed-off-by: NLluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: NLluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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