Remove "event-loop.h" inclusion from "top.h"

Older GCCs (e.g. GCC 4.4 in CentOS 6) chokes on having two identical
typedefs like this:

typedef void *p;
typedef void *p;

The event-loop.h header does not have a guard against double-inclusion.
Not the best solution, but it works and eventually 7.12 will fall into
obsolescence anyway.

Signed-off-by: Alexey Neyman <stilor@att.net>

packages/gdb/7.12.1/0006-duplicate-typedef.patch

@@ -0,0 +1,16 @@
+
+
+---
+ gdb/top.h |    1 -
+ 1 file changed, 1 deletion(-)
+
+--- a/gdb/top.h
++++ b/gdb/top.h
+@@ -21,7 +21,6 @@
+ #define TOP_H
+ 
+ #include "buffer.h"
+-#include "event-loop.h"
+ 
+ struct tl_interp_info;
+