Support the -Orecurse option properly.

In this mode we still collect all the output from a given target and
dump it at once.  However we don't treat recursive lines any differently
from non-recursive lines.  Also we don't print enter/leave messages
after every dump.  However we do ensure that we always print them once
to stdout, so the parent make will collect it properly.

tests/scripts/features/output-sync

@@ -135,8 +135,6 @@ foo: end
 #MAKE#[1]: Entering directory '#PWD#/bar'
 bar: start
 bar: end
-#MAKE#[1]: Leaving directory '#PWD#/bar'
-#MAKE#[1]: Entering directory '#PWD#/bar'
 baz: start
 baz: end
 #MAKE#[1]: Leaving directory '#PWD#/bar'\n", 0, 6);