[Bug testsuite/49375] Target libstdc++.so used by host cc1plus

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49375

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-06-12 
11:40:57 UTC ---
LD_LIBRARY_PATH should be only set for executing testcases, not for
compiling them.