Merge "core: Remove ABI effects of MALLOC_DEBUG."

CHANGES

UPGRADE.txt

build_tools/make_buildopts_h

include/asterisk.h

include/asterisk/astmm.h

include/asterisk/chanvars.h

include/asterisk/compat.h

include/asterisk/config.h

include/asterisk/hashtab.h

include/asterisk/heap.h

include/asterisk/stringfields.h

include/asterisk/strings.h

include/asterisk/utils.h

main/astmm.c

main/chanvars.c

main/config.c

main/datastore.c

main/hashtab.c

main/heap.c

main/strcompat.c