Lib: Fix macro/keyword collisions

Old code breaks with some versions of bison

lib/buffer.h

@@ -13,10 +13,14 @@
 #include "lib/resource.h"
 #include "sysdep/config.h"
 
-#define BUFFER(type)		struct { type *data; uint used, size; }
+#define BUFFER_(type)		struct { type *data; uint used, size; }
 #define BUFFER_TYPE(v)		typeof(* (v).data)
 #define BUFFER_SIZE(v)		((v).size * sizeof(* (v).data))
 
+#ifndef PARSER
+#define BUFFER(type) BUFFER_(type)
+#endif
+
 #define BUFFER_INIT(v,pool,isize)					\
   ({									\
     (v).used = 0;							\

lib/flowspec.h

@@ -91,7 +91,7 @@ const byte *flow6_next_part(const byte *pos, const byte *end);
 
 /* A data structure for keep a state of flow builder */
 struct flow_builder {
-  BUFFER(byte) data;
+  BUFFER_(byte) data;
   enum flow_type this_type;
   enum flow_type last_type;
   u16 last_op_offset;			/* Position of last operator in data.data */

lib/timer.h

@@ -30,7 +30,7 @@ typedef struct timer
 
 struct timeloop
 {
-  BUFFER(timer *) timers;
+  BUFFER_(timer *) timers;
   btime last_time;
   btime real_time;
 };

proto/static/static.h

@@ -25,7 +25,7 @@ struct static_proto {
   struct proto p;
 
   struct event *event;			/* Event for announcing updated routes */
-  BUFFER(struct static_route *) marked;	/* Routes marked for reannouncement */
+  BUFFER_(struct static_route *) marked; /* Routes marked for reannouncement */
   rtable *igp_table_ip4;		/* Table for recursive IPv4 next hop lookups */
   rtable *igp_table_ip6;		/* Table for recursive IPv6 next hop lookups */
 };