malloc(3) leak detection gains backtraces

Contributed by rueda on 2023-12-05 from the ottomalloc-has-your-back(trace) dept.

Otto Moerbeek (otto@), the author of OpenBSD's malloc(3) implementation, has comitted another great feature - backtraces for leak detection:

CVSROOT:	/cvs
Module name:	src
Changes by:	otto@cvs.openbsd.org	2023/12/04 00:01:45

Modified files:
	lib/libc/stdlib: malloc.3 malloc.c 

Log message:
Save backtraces to show in leak dump. Depth of backtrace set by
malloc option D (aka 1), 2, 3 or 4.  No performance impact if not
used.  ok asou@

Otto's original message to tech@ includes an example use of the feature.

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