* speclib: Don't use /dev/null as DLL name. Just default to what's already in

.def file.
* exceptions.cc (sig_handle): Remove last vestiges of SA_NOCLDSTOP code which
caused SIGCHLD to be ignored.

winsup/cygwin/speclib

@@ -19,4 +19,4 @@ def=$1; shift
 trap "rm /tmp/$$.def" 0 1 2 15
 (echo "LIBRARY cygwin1.dll
 EXPORTS"; $nm --extern-only --defined-only $* | sed -e '/^[ 	]*$/d' -e '/:$/d' -e 's/^.* _\(.*\)/\1/' |  grep $v -f - -w $def |egrep -vi '^library|exports|^$' | sort) > /tmp/$$.def
-exec $dlltool -d /tmp/$$.def -l "$lib" -D /dev/null
+exec $dlltool -d /tmp/$$.def -l "$lib"