Remove long-dead support for platforms without sig_atomic_t.
C89 requires <signal.h> to define sig_atomic_t, and there is no evidence in the buildfarm that any supported platforms don't comply. Remove the configure test to stop wasting build cycles on a purely historical issue. (Once upon a time, we cared about supporting C89-compliant compilers on machines with pre-C89 system headers, but that use-case has been dead for quite a few years.) I have some other fixes planned in this area, but let's start with this to see if the buildfarm produces any surprising results.
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