Skipping TestConstVariables on Linux.

The test was marked as expectedFailureLinux, but now it passes with gcc and some versions of clang.  Newer versions of clang introduce a failure due to bad DWARF information.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@176581 91177308-0d34-0410-b5e6-96231b3b80d8