Fix a bug involving alias (N_INDR) symbols.  When building a shared library with a shared object dependency that contained alias symbols, the linker incorrectly counted the number of symbols that would be written, resulting in a fatal internal error.  Since our libc now contains some alias symbols (in "net/res_stubs.c"), this was sufficient to tickle the bug:  "ld -Bshareable foo.so -lc".  To fix it, I moved the accounting of alias symbols to a later point in the processing, where it is possible to count only those symbols that will actually be written to the output file.
Fix a bug involving alias (N_INDR) symbols.  When building a shared
library with a shared object dependency that contained alias symbols,
the linker incorrectly counted the number of symbols that would be
written, resulting in a fatal internal error.  Since our libc now
contains some alias symbols (in "net/res_stubs.c"), this was
sufficient to tickle the bug:  "ld -Bshareable foo.so -lc".  To
fix it, I moved the accounting of alias symbols to a later point
in the processing, where it is possible to count only those symbols
that will actually be written to the output file.

This fix is well-confined to affect alias symbols only.  I have
tested it with a full "make world".  I am going to merge it into
-2.2 after a few more days of living with it in -current.

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