In order to make "make distclean" (and friends) work, we need to
*always* invoke the embedded configure script -- even if we know that
we're not going to use this component.
But in cases where we know we're not going to use this component, we
also need to avoid the side effects of the code path that is used when
we *do* want to use this component. So split the two possibilities
into two different macros:
1. MCA_opal_event_libevent2022_FAKE_CONFIG: which does almost nothing
except invoke the underlying "configure" script.
2. MCA_opal_event_libevent2022_REAL_CONFIG: which does all the real
work (including invoking the underlying "configure" script).
Signed-off-by: Jeff Squyres <jsquyres@cisco.com>
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