Fix typo, add prototype for use_filename().

Zend/zend-scanner.l

@@ -490,7 +490,7 @@ int use_filename(char *filename, zend_bool unique CLS_DC)
 	filenamelen = strlen(filename);
 	newfile = emalloc(filenamelen + 5);
 	strcpy(newfile, filename);
-	strcpy(newfile+strnamelen, ".php");
+	strcpy(newfile+filenamelen, ".php");
 	newfile[filenamelen+4] = '\0';
 
 	file_handle.type = ZEND_HANDLE_FILENAME;

Zend/zend_compile.h

@@ -347,6 +347,7 @@ void do_extended_fcall_end(CLS_D);
 BEGIN_EXTERN_C()
 ZEND_API int require_file(zend_file_handle *file_handle, zend_bool unique CLS_DC);	
 ZEND_API int require_filename(char *filename, zend_bool unique CLS_DC);
+ZEND_API int use_filename(char *filename, zend_bool unique CLS_DC);
 ZEND_API zend_op_array *compile_files(int mark_as_ref CLS_DC, int file_count, ...);
 ZEND_API zend_op_array *v_compile_files(int mark_as_ref CLS_DC, int file_count, va_list files);
 ZEND_API zend_op_array *compile_string(zval *source_string CLS_DC);