[lit] Replace generator expressions in lit.site.cfg

The lit site configuration for the test suite can contain generator
expressions such as $<TARGET_FILE:debugserver> that need to be
substituted.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@331277 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed