build_rpm: fix source for db6

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>
build_rpm: drop autoreconf for file, not needed anymore

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>
build_rpm: fix RPM patches

Signed-off-by: David Abdurachmanov <davidlt@cern.ch>