filesystem: turn unused caseinsensitive argument in InitStdio into a reserved argument (set to true by default)

filesystem/filesystem.c

@@ -1327,7 +1327,7 @@ void _Sys_Error( const char *fmt, ... )
 FS_Init
 ================
 */
-qboolean FS_InitStdio( qboolean caseinsensitive, const char *rootdir, const char *basedir, const char *gamedir, const char *rodir )
+qboolean FS_InitStdio( qboolean unused_set_to_true, const char *rootdir, const char *basedir, const char *gamedir, const char *rodir )
 {
 	stringlist_t	dirs;
 	qboolean		hasBaseDir = false;

filesystem/filesystem.h

@@ -129,7 +129,7 @@ typedef void (*fs_event_callback_t)( const char *path );
 
 typedef struct fs_api_t
 {
-	qboolean (*InitStdio)( qboolean caseinsensitive, const char *rootdir, const char *basedir, const char *gamedir, const char *rodir );
+	qboolean (*InitStdio)( qboolean unused_set_to_true, const char *rootdir, const char *basedir, const char *gamedir, const char *rodir );
 	void (*ShutdownStdio)( void );
 
 	// search path utils