to 2. This makes them agree with the declarations in libgcc, and
clears the way once again for linking c++rt0.o into all libraries,
and eliminating CPLUSPLUSLIB from <bsd.lib.mk>. (I have not made
that change yet, because there is still a bootstrapping problem
for "make world".)
Also, removed a check which ensured that the constructor count in
the first word of __CTOR_LIST__ was greater than zero before
traversing the list. I had added that check earlier, but it is no
longer necessary, now that there is guaranteed to be at least 2
words in __CTOR_LIST__.
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