Fix 'make dist' for BSD gmake
Fix 'make dist' for BSD gmake

'make dist' used a 'make' command rather than '$(MAKE)' so when called using 'gmake dist'
on BSD it improperly switched to using BSD make for the deps building in 'dist'

authbox-lib/riak,yangchengjian/riak,laurenrother/riak,elkingtonmcb/riak,GabrielNicolasAvellaneda/riak,glickbot/riak,basho/riak,biddyweb/riak,amyvmiwei/riak,xuejianhai/riak,DavidAlphaFox/riak