tests: Update for jemalloc's option parsing

[emaste]

Summary

MALLOC_OPTIONS=J -> MALLOC_CONF=junk:true

PR:             287357
Event:          Kitchener-Waterloo Hackathon 202506
Sponsored by:   The FreeBSD Foundation

[emaste]

include bpf tests in same review

[olce]

Seems fine.

There's also a couple of occurences of MALLOC_OPTIONS in contrib code (bmake, openssh (they just don't support MALLOC_CONF in their configure.ac)), I guess you want to handle separately (or not right now)?

Seems we could change also usr.bin/bmake/unit-tests/Makefile (not contrib).

[emaste]

The PR has a list -- usr.bin/bmake/unit-tests/Makefile has both MALLOC_CONF and MALLOC_OPTIONS set so it's fine, although inconsistent between the two.

[olce]

In D50910#1162053, @emaste wrote:

The PR has a list -- usr.bin/bmake/unit-tests/Makefile has both MALLOC_CONF and MALLOC_OPTIONS set so it's fine, although inconsistent between the two.

Hadn't seen the PR.