Stop seeking out the libieee.a library and linking to it when found.

The latest release of the GNU C library, glibc-2.27 has done away with
the libieee.a library. This prompts a review of why Tcl has been using it.

Since Tcl 8.4.0, Tcl has stopped using the matherr() machinery, so we don't
need it anymore for that.

Since Tcl 8.5.0, Tcl post-processes ERANGE for itself when floating point
underflow or overflow can sensibly produce a 0.0 or Inf result instead of
raising an error. We no longer need to configure the system math library to
silence these reports.

A conseqeunce of this change is that TCL_LIBS will no longer include the
linker option -lieee .  This can potentially change the behavior of programs
that embed libtcl.  If so, though, those same programs are going to also have
behavior changed as the new glibc release gets into routine use. We're doing
those programs a favor by stopping masking the discovery that they need to
be updated.

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