From Craig Silverstein: preliminary support for OPTION in linker script.

gold/script-c.h

@@ -66,6 +66,10 @@ script_start_as_needed(void* closure);
 extern void
 script_end_as_needed(void* closure);
 
+/* Called by the bison parser to parse an OPTION.  */
+extern void
+script_parse_option(void* closure, const char*);
+
 #ifdef __cplusplus
 }
 #endif