Fix test suite make so that -std=c++11 gets set properly for supported compilers and -std=c++0x gets set only for gcc 4.6 versions. Previously, -std=c++0x was being set for all compilers.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@187080 91177308-0d34-0410-b5e6-96231b3b80d8