Remove LIT_SITE_CFG_IN_FOOTER, clang-tools-extra

It's always replaced with the same (short) static string, so just put that
there directly.

No intended behavior change.
https://reviews.llvm.org/D51357

llvm-svn: 341130

clang-tools-extra/test/lit.site.cfg.in

@@ -23,7 +23,8 @@ except KeyError:
     key, = e.args
     lit_config.fatal("unable to find %r parameter, use '--param=%s=VALUE'" % (key,key))
 
-@LIT_SITE_CFG_IN_FOOTER@
+import lit
+lit.llvm.initialize(lit_config, config)
 
 # Let the main config do the real work.
 lit_config.load_config(config, "@CLANG_TOOLS_SOURCE_DIR@/test/lit.cfg")