Clarify malloc DEBUG configuration
Clarify malloc DEBUG configuration

The recommended configuration for production use is to run without DEBUG
and with assert() compiled out, so do that. At the same time, fix the
malloc configuration to compile with DEBUG=1 in case anyone wants to do
that.

Weichen81/solo5,djwillia/solo5,Solo5/solo5,mato/solo5,mato/solo5,Weichen81/solo5,djwillia/solo5,djwillia/solo5,Weichen81/solo5,Solo5/solo5,mato/solo5