remove 'global stream' specialities in codeview -> rdi conversion; just have the caller pass all units, and in the case of pdb conversion, we simply make a global unit at that layer.

project.raddbg

@@ -7,6 +7,7 @@ target:
   working_directory: "../raddebugger"
   arguments: "--user:C:/devel/raddebugger/build/raddbg_test.user"
   debug_subprocesses: 0
+  enabled: 1
 }
 target:
 {
@@ -34,5 +35,4 @@ target:
 {
   executable: "build/ryan_scratch.exe"
   working_directory: build
-  enabled: 1
 }