tv a4c4ea7686 Fix a very old and annoying bug: Adding suffixes to sufflist wasn't setting
a refCount of 1 to indicate its presence on sufflist.  Hence suffixes were
being removed by Suff_EndTransform() and being freed before all the
referential links were removed.  This resulted in a malloc warning on 1.5.x:
  make in free(): warning: chunk is already free.

This could be reproduced with the following simple Makefile passed to
"make -r":
=====
.SUFFIXES: .l .c
.l.c:
foo:
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..
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