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From: Glenn Morris <rgm@gnu.org>
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Subject: SIGTYPE/RETSIGTYPE
Date: Sat, 26 Mar 2011 15:34:52 -0400
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The autoconf manual says:

Obsolete Macros: AC_TYPE_SIGNAL

    If signal.h declares signal as returning a pointer to a function
    returning void, define RETSIGTYPE to be void; otherwise, define it
    to be int. These days, it is portable to assume C89, and that signal
    handlers return void, without needing to use this macro or RETSIGTYPE. 

So is it OK to remove this test from Emacs's configure.in, and replace
RETSIGTYPE (and SIGTYPE, which we define equal to RETSIGTYPE in
AH_BOTTOM) with just `void' everywhere in the sources?