erlc: Limit the number of schedulers if applicable
erlc: Limit the number of schedulers if applicable

This fixes ERL-1186 and similar issues, where the system ran out of
threads because the emulators spawned by `erlc` used the default
number of schedulers even though all compilers except HiPE are
single-threaded and don't need that many.

erlang/otp,lrascao/otp,uabboli/otp,lrascao/otp,dumbbell/otp,jj1bdx/otp,rlipscombe/otp,rlipscombe/otp,mikpe/otp,electricimp/otp,vinoski/otp,dgud/otp,kvakvs/otp,g-andrade/otp,vinoski/otp,potatosalad/otp,electricimp/otp,dumbbell/otp,uabboli/otp,bjorng/otp,rlipscombe/otp,dgud/otp,kvakvs/otp,jj1bdx/otp,potatosalad/otp,jj1bdx/otp,ferd/otp,mikpe/otp,potatosalad/otp,electricimp/otp,vinoski/otp,erlang/otp,dumbbell/otp,isvilen/otp,bjorng/otp,potatosalad/otp,ferd/otp,emacsmirror/erlang,emacsmirror/erlang,vladdu/otp,lrascao/otp,g-andrade/otp,electricimp/otp,ferd/otp,electricimp/otp,bjorng/otp,ferd/otp,vladdu/otp,vladdu/otp,isvilen/otp,vladdu/otp,potatosalad/otp,dgud/otp,getong/otp,emacsmirror/erlang,emacsmirror/erlang,getong/otp,rlipscombe/otp,rlipscombe/otp,lrascao/otp,jj1bdx/otp,jj1bdx/otp,bjorng/otp,electricimp/otp,mikpe/otp,vinoski/otp,g-andrade/otp,rlipscombe/otp,dgud/otp,potatosalad/otp,uabboli/otp,bjorng/otp,uabboli/otp,getong/otp,g-andrade/otp,jj1bdx/otp,vinoski/otp,emacsmirror/erlang,isvilen/otp,jj1bdx/otp,rlipscombe/otp,uabboli/otp,electricimp/otp,g-andrade/otp,dgud/otp,dgud/otp,kvakvs/otp,bjorng/otp,isvilen/otp,g-andrade/otp,lrascao/otp,isvilen/otp,mikpe/otp,ferd/otp,jj1bdx/otp,erlang/otp,erlang/otp,erlang/otp,kvakvs/otp,kvakvs/otp,emacsmirror/erlang,g-andrade/otp,getong/otp,kvakvs/otp,getong/otp,mikpe/otp,getong/otp,erlang/otp,getong/otp,mikpe/otp,uabboli/otp,lrascao/otp,bjorng/otp,rlipscombe/otp,dgud/otp,vladdu/otp,kvakvs/otp,dumbbell/otp,potatosalad/otp,rlipscombe/otp,vinoski/otp,mikpe/otp,isvilen/otp,kvakvs/otp,dumbbell/otp,dgud/otp,erlang/otp,isvilen/otp,dumbbell/otp,isvilen/otp,dumbbell/otp,dumbbell/otp,g-andrade/otp,vinoski/otp,erlang/otp,dumbbell/otp,mikpe/otp,electricimp/otp,emacsmirror/erlang,ferd/otp,uabboli/otp,potatosalad/otp,dumbbell/otp,dgud/otp,mikpe/otp,vladdu/otp,bjorng/otp,isvilen/otp,emacsmirror/erlang,bjorng/otp,g-andrade/otp,ferd/otp,ferd/otp,vinoski/otp,vinoski/otp,mikpe/otp,potatosalad/otp,erlang/otp,dgud/otp,vladdu/otp,emacsmirror/erlang,getong/otp,lrascao/otp,vladdu/otp,electricimp/otp,jj1bdx/otp,erlang/otp,jj1bdx/otp,bjorng/otp,g-andrade/otp,rlipscombe/otp,vinoski/otp,emacsmirror/erlang,potatosalad/otp,getong/otp,isvilen/otp,ferd/otp,getong/otp,kvakvs/otp,uabboli/otp,lrascao/otp,uabboli/otp,vladdu/otp,lrascao/otp