(svn r10116) -Fix [FS#850]: remove invalid characters (for the file system) from savegame names. Based on a patch by TheJosh.

src/fileio.h

@@ -20,6 +20,7 @@ FILE *FioFOpenFile(const char *filename);
 bool FioCheckFileExists(const char *filename);
 void FioCreateDirectory(const char *filename);
 
+void SanitizeFilename(char *filename);
 void AppendPathSeparator(char *buf, size_t buflen);
 void DeterminePaths(const char *exe);