libdebugger: Reorganize debugger_interface subdir.

- Split into separate subdirectories for each interface type, as is done in
  the target_host_interface subdir. Preparation for the remote interfaces,
  which will have quite a few more components than the existing local ones.

src/kits/debugger/Jamfile

@@ -44,7 +44,8 @@ SEARCH_SOURCE += [ FDirName $(SUBDIR) debug_info ] ;
 SEARCH_SOURCE += [ FDirName $(SUBDIR) debug_info loading_state_handlers ] ;
 SEARCH_SOURCE += [ FDirName $(SUBDIR) debug_managers ] ;
 SEARCH_SOURCE += [ FDirName $(SUBDIR) debugger_interface ] ;
-SEARCH_SOURCE += [ FDirName $(SUBDIR) debugger_interface interfaces ] ;
+SEARCH_SOURCE += [ FDirName $(SUBDIR) debugger_interface core ] ;
+SEARCH_SOURCE += [ FDirName $(SUBDIR) debugger_interface local ] ;
 SEARCH_SOURCE += [ FDirName $(SUBDIR) elf ] ;
 SEARCH_SOURCE += [ FDirName $(SUBDIR) files ] ;
 SEARCH_SOURCE += [ FDirName $(SUBDIR) ids ] ;
@@ -143,8 +144,10 @@ local sources =
 	DebugEvent.cpp
 	DebuggerInterface.cpp
 
-	# debugger_interface/interfaces
+	# debugger_interface/core
 	CoreFileDebuggerInterface.cpp
+
+	# debugger_interface/local
 	LocalDebuggerInterface.cpp
 
 	# elf