remove manual fiddling with MALLOC_OPTIONS from libc regress tests

these options should be set globally (sysctl) when running regress as opposed to having
individual tests set it, barring a few spec

remove manual fiddling with MALLOC_OPTIONS from libc regress tests

these options should be set globally (sysctl) when running regress as opposed to having
individual tests set it, barring a few specific exceptions.

ok bluhm@

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I am retiring my old email address; replace it with my OpenBSD one.

Add setenv/putenv regress