[bug #8297] Add a non-posix feature for parallel mode.

[Paul D. Smith]

Follow-up Comment #3, bug #8297 (project make):

Yes, but I don't like that syntax because it seems to allow both kinds of
"rules" to be defined at the same time; consider:

  foo + bar baz boz + biz:

What does this mean?  In discussions on the GNU make developers' list we
discussed a syntax like this:

    foo bar |: biz baz
    %.y %.z |: %.a

and:

    foo bar &: biz baz
    %.y %.z &: %.a

The "&:" separator means that all targets are built with one invocation
(default today for pattern rules) and the "|:" separator means each target is
built with a separate invocation (default today for explicit rules).  The
unadorned ":" would keep its current behavior (different depending on whether
you use pattern or explicit rules).

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