[Makefile] Use .PRECIOUS instead of .SECONDARY for bin/%.tmp targets
Revert "Use .SECONDARY instead of .PRECIOUS for bin/%.tmp targets."
This reverts commit
de29e5a39c5ae0ca91b61eaa139a277943dfc7fc.
.SECONDARY doesn't seem to work properly with the target patterns of
implicit rules. In particular, a "make clean ; make bin/rtl8139.dsk"
will correctly leave the bin/rtl8139.dsk.tmp file present when .PRECIOUS
is used, but not when .SECONDARY is used.
This is slightly irritating since we don't want the
"do-not-delete-if-interrupted" semantics of .PRECIOUS, but it seems to be
the best compromise.