do not run nifs-clean with erlang-clean
do not run nifs-clean with erlang-clean

if the Emakefile is changed, the erlang compile step first executes
the erlang-clean target potentially after building the nifs so they
were deleted again without re-building them afterwards

scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris,scalaris-team/scalaris