Fix regression introduced in r1042868. Actually enable -Wl,--no-undefined flag when it is supported.
Fix regression introduced in r1042868.
Actually enable -Wl,--no-undefined flag when it is supported.

* configure.ac
  (disallowing-of-undefined-references): Don't introduce a subshell, in which
   some variables would be set.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1091566 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion