* configure.in: Allow --enable-newvfork to turn NEWVFORK on and off.

* configure: Regenerate.

winsup/cygwin/configure.in

@@ -179,12 +179,13 @@ esac
 
 AC_ARG_ENABLE(vfork,
 [ --enable-vfork		Build a cygwin DLL which uses experimental vfork code],
-[case "${enableval}" in
-yes)	 AC_DEFINE(NEWVFORK) ;;
-no)	 ;;
-esac
+vfork="${enableval}"
 ])
 
+case "$vfork" in
+no)	 ;;
+yes|*)	 AC_DEFINE_UNQUOTED(NEWVFORK) ;;
+esac
 
 dnl The only time we might want to transform the install names
 dnl is for unix x cygwin.  Otherwise we don't.  For now we don't