MINOR: debug: also add a pointer to struct global to post_mortem

The pointer to struct global is also an important element to have in
post_mortem given that it's used a lot to take decisions in the code.
Let's just add it. It's worth noting that we could get rid of argc/argv
at this point since they're also present in the global struct, but they
don't cost much there anyway.

src/debug.c

@@ -156,6 +156,7 @@ struct post_mortem {
 	struct thread_ctx  *thread_ctx;  // pointer to ha_thread_ctx
 	struct list *pools;              // pointer to the head of the pools list
 	struct proxy **proxies;          // pointer to the head of the proxies list
+	struct global *global;           // pointer to the struct global
 
 	/* info about identified distinct components (executable, shared libs, etc).
 	 * These can be all listed at once in gdb using:
@@ -2564,6 +2565,7 @@ static int feed_post_mortem()
 	post_mortem.thread_ctx  = ha_thread_ctx;
 	post_mortem.pools = &pools;
 	post_mortem.proxies = &proxies_list;
+	post_mortem.global = &global;
 
 	return ERR_NONE;
 }