RocksDB's build system does not correctly generate dependencies - if
headers have been removed in the SPDK repository since the previous
build, the .d files will prevent the build from continuing.
Avoid this by cleaning up any left-over build outputs from the previous
run.
Change-Id: Ib8669273eb38c241f83e14714683693430469462
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
bf2795c65d