Rebase to FSF GDB 7.4.50.20120602.

- [testsuite] BuildRequire gcc-go.
- Drop printing 2D C++ vectors as matrices which no longer worked (BZ 562763).
- Fix dejagnu-1.5-4.fc17 compatibility for Go (for BZ 635651).
- Use librpm.so.3 for rpm-4.10.0 in Fedora 18.
- Revert recent breakage of UNIX objfiles order for symbols lookup.

gdb-6.8-attach-signalled-detach-stopped.patch

@@ -1,8 +1,8 @@
-Index: gdb-7.0.50.20100115/gdb/linux-nat.c
+Index: gdb-7.4.50.20120602/gdb/linux-nat.c
 ===================================================================
---- gdb-7.0.50.20100115.orig/gdb/linux-nat.c	2010-01-15 11:53:34.000000000 +0100
-+++ gdb-7.0.50.20100115/gdb/linux-nat.c	2010-01-15 12:13:53.000000000 +0100
-@@ -175,6 +175,9 @@ blocked.  */
+--- gdb-7.4.50.20120602.orig/gdb/linux-nat.c	2012-06-02 20:51:58.000000000 +0200
++++ gdb-7.4.50.20120602/gdb/linux-nat.c	2012-06-02 20:54:30.127529159 +0200
+@@ -180,6 +180,9 @@ blocked.  */
  static struct target_ops *linux_ops;
  static struct target_ops linux_ops_saved;
  
@@ -12,7 +12,7 @@ Index: gdb-7.0.50.20100115/gdb/linux-nat.c
  /* The method to call, if any, when a new thread is attached.  */
  static void (*linux_nat_new_thread) (struct lwp_info *);
  
-@@ -933,7 +936,14 @@ Attaching after process %d fork to child
+@@ -909,7 +912,14 @@ holding the child stopped.  Try \"set de
  	  parent_inf->waiting_for_vfork_done = 0;
  	}
        else if (detach_fork)
@@ -28,7 +28,7 @@ Index: gdb-7.0.50.20100115/gdb/linux-nat.c
  
        /* Note that the detach above makes PARENT_INF dangling.  */
  
-@@ -1427,6 +1437,7 @@ linux_nat_post_attach_wait (ptid_t ptid,
+@@ -1377,6 +1387,7 @@ linux_nat_post_attach_wait (ptid_t ptid,
        if (debug_linux_nat)
  	fprintf_unfiltered (gdb_stdlog,
  			    "LNPAW: Attaching to a stopped process\n");
@@ -36,8 +36,8 @@ Index: gdb-7.0.50.20100115/gdb/linux-nat.c
  
        /* The process is definitely stopped.  It is in a job control
  	 stop, unless the kernel predates the TASK_STOPPED /
-@@ -1757,6 +1768,9 @@ GPT: lwp %s had signal %s, but it is in 
- 			    target_signal_to_string (signo));
+@@ -1805,6 +1816,9 @@ get_pending_status (struct lwp_info *lp,
+ 			    gdb_signal_to_string (signo));
      }
  
 +  if (*status == 0 && GET_PID (lp->ptid) == pid_was_stopped)
@@ -46,7 +46,7 @@ Index: gdb-7.0.50.20100115/gdb/linux-nat.c
    return 0;
  }
  
-@@ -1866,6 +1880,8 @@ linux_nat_detach (struct target_ops *ops
+@@ -1918,6 +1932,8 @@ linux_nat_detach (struct target_ops *ops
      }
    else
      linux_ops->to_detach (ops, args, from_tty);
@@ -55,7 +55,7 @@ Index: gdb-7.0.50.20100115/gdb/linux-nat.c
  }
  
  /* Resume LP.  */
-@@ -2031,6 +2047,14 @@ linux_nat_resume (struct target_ops *ops
+@@ -2083,6 +2099,14 @@ linux_nat_resume (struct target_ops *ops
       resume_callback.  */
    lp->stopped = 0;
  
@@ -70,7 +70,7 @@ Index: gdb-7.0.50.20100115/gdb/linux-nat.c
    if (resume_many)
      iterate_over_lwps (ptid, resume_callback, NULL);
  
-@@ -3923,6 +3947,8 @@ linux_nat_mourn_inferior (struct target_
+@@ -4132,6 +4156,8 @@ linux_nat_mourn_inferior (struct target_
         there are other viable forks to debug.  Delete the exiting
         one and context-switch to the first available.  */
      linux_fork_mourn_inferior ();
@@ -79,11 +79,11 @@ Index: gdb-7.0.50.20100115/gdb/linux-nat.c
  }
  
  /* Convert a native/host siginfo object, into/from the siginfo in the
-Index: gdb-7.0.50.20100115/gdb/testsuite/gdb.threads/attach-stopped.exp
+Index: gdb-7.4.50.20120602/gdb/testsuite/gdb.threads/attach-stopped.exp
 ===================================================================
---- gdb-7.0.50.20100115.orig/gdb/testsuite/gdb.threads/attach-stopped.exp	2010-01-01 08:32:06.000000000 +0100
-+++ gdb-7.0.50.20100115/gdb/testsuite/gdb.threads/attach-stopped.exp	2010-01-15 11:54:57.000000000 +0100
-@@ -62,7 +62,65 @@ proc corefunc { threadtype } {
+--- gdb-7.4.50.20120602.orig/gdb/testsuite/gdb.threads/attach-stopped.exp	2012-01-04 09:27:55.000000000 +0100
++++ gdb-7.4.50.20120602/gdb/testsuite/gdb.threads/attach-stopped.exp	2012-06-02 20:52:08.893505403 +0200
+@@ -63,7 +63,65 @@ proc corefunc { threadtype } {
      gdb_reinitialize_dir $srcdir/$subdir
      gdb_load ${binfile}