Use ANSI/POSIX float notation uniformly for the command line

This is consistent with the vlcrc syntax. Shell scripts et al. are
unlikely to be aware of the locale decimal separator anyway.

src/config/cmdline.c

@@ -27,7 +27,8 @@
 
 #include <vlc_common.h>
 #include "../libvlc.h"
-#include "vlc_keys.h"
+#include <vlc_keys.h>
+#include <vlc_charset.h>
 
 #ifdef HAVE_GETOPT_LONG
 #   ifdef HAVE_GETOPT_H
@@ -297,7 +298,7 @@ int __config_LoadCmdLine( vlc_object_t *p_this, int *pi_argc,
                         config_PutInt( p_this, psz_name, strtol(optarg, 0, 0));
                         break;
                     case CONFIG_ITEM_FLOAT:
-                        config_PutFloat( p_this, psz_name, (float)atof(optarg) );
+                        config_PutFloat( p_this, psz_name, us_atof(optarg) );
                         break;
                     case CONFIG_ITEM_KEY:
                         config_PutInt( p_this, psz_name, ConfigStringToKey( optarg ) );