* modules/*: fixed implicit function declarations.

modules/control/http/rpn.c

@@ -26,6 +26,7 @@
 #include "http.h"
 #include "vlc_url.h"
 #include "vlc_meta.h"
+#include "vlc_strings.h"
 
 static vlc_object_t *GetVLCObject( intf_thread_t *p_intf,
                                    const char *psz_object,

modules/demux/playlist/xspf.c

@@ -27,6 +27,7 @@
 #include "playlist.h"
 #include "vlc_xml.h"
 #include "vlc_strings.h"
+#include "vlc_url.h"
 #include "xspf.h"
 
 /**

modules/misc/playlist/xspf.c

@@ -26,6 +26,7 @@
 #include "vlc_meta.h"
 #include "vlc_strings.h"
 #include "xspf.h"
+#include "charset.h"
 
 /**
  * \brief Prints the XSPF header to file, writes each item by xspf_export_item()