More signal-handler cleanup.
* configure.ac (FLOAT_CHECK_DOMAIN): Comment fix (Bug#12327). * src/floatfns.c: Comment fix. * src/lisp.h (force_auto_save_soon): Declare regardless of SIGDANGER. SIGDANGER might not be in scope so "#ifdef SIGDANGER" is not right, and anyway the declaration is harmless even if SIGDANGER is not defined. * src/syssignal.h (SIGIO): Also #undef if (! defined FIONREAD || defined BROKEN_FIONREAD). systty.h formerly did this, but other source files not surprisingly expected syssignal.h to define, or not define, SIGIO, and it's cleaner to do it that way, for consistency. Include <sys/ioctl.h>, for FIONREAD. * src/systty.h (SIGIO): Do not #undef here; it's now syssignal.h's job. This eliminates a problem whereby other files mysteriously had to include "syssignal.h" before including "systty.h" if they wanted to use "#ifdef SIGIO".
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