Remove unused or unnecessary header includes

git-svn-id: svn://localhost/ardour2/branches/3.0@12905 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/session.cc

@@ -45,9 +45,7 @@
 #include "pbd/file_utils.h"
 #include "pbd/convert.h"
 #include "pbd/strsplit.h"
-#include "pbd/strsplit.h"
 #include "pbd/unwind.h"
-#include "pbd/filesystem.h"
 
 #include "ardour/amp.h"
 #include "ardour/analyser.h"

libs/ardour/session_state.cc

@@ -72,7 +72,6 @@
 #include "pbd/file_utils.h"
 #include "pbd/pathscanner.h"
 #include "pbd/pthread_utils.h"
-#include "pbd/search_path.h"
 #include "pbd/stacktrace.h"
 #include "pbd/convert.h"
 #include "pbd/clear_dir.h"

libs/ardour/session_state_utils.cc

@@ -26,7 +26,6 @@
 #include "pbd/compose.h"
 #include "pbd/error.h"
 #include "pbd/file_utils.h"
-#include "pbd/filesystem.h"
 
 #include "ardour/session_state_utils.h"
 #include "ardour/filename_extensions.h"

libs/pbd/test/filesystem_test.cc

@@ -2,7 +2,6 @@
 #include <stdlib.h>
 #include "filesystem_test.h"
 #include "pbd/file_utils.h"
-#include "pbd/filesystem.h"
 
 using namespace std;
 

libs/surfaces/osc/osc.cc

@@ -32,7 +32,6 @@
 
 #include <pbd/pthread_utils.h>
 #include <pbd/file_utils.h>
-#include <pbd/filesystem.h>
 #include <pbd/failed_constructor.h>
 
 #include "ardour/session.h"