gdb: Remove upstreamed SIGINT patch

The problem was fixed upstream, see:
https://sourceware.org/bugzilla/show_bug.cgi?id=18945
https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=4c35c4c6a779c79e456b7a5311f74aafc9026bd5

Link: https://github.com/openwrt/openwrt/pull/16665
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/devel/gdb/patches/130-gdb-ctrl-c.patch

@@ -1,35 +0,0 @@
-From 63df98fa78c8a6e12b40ebdc5c155838d2bf8b5f Mon Sep 17 00:00:00 2001
-From: Khem Raj <raj.khem@gmail.com>
-Date: Thu, 29 Nov 2018 18:00:23 -0800
-Subject: [PATCH 11/11] gdbserver ctrl-c handling
-
-This problem was created by the upstream commit 78708b7c8c
-After applying the commit, it will send SIGINT to the process
-group(-signal_pid).
-But if we use gdbserver send SIGINT, and the attached process is not a
-process
-group leader, then the "kill (-signal_pid, SIGINT)" returns error and
-fails  to
-interrupt the attached process.
-
-Upstream-Status: Submitted
-[https://sourceware.org/bugzilla/show_bug.cgi?id=18945]
-
-Author: Josh Gao
-Signed-off-by: Zhixiong Chi <zhixiong.chi@windriver.com>
-Signed-off-by: Khem Raj <raj.khem@gmail.com>
----
- gdbserver/linux-low.cc | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
---- a/gdbserver/linux-low.cc
-+++ b/gdbserver/linux-low.cc
-@@ -5525,7 +5525,7 @@ linux_process_target::request_interrupt
- {
-   /* Send a SIGINT to the process group.  This acts just like the user
-      typed a ^C on the controlling terminal.  */
--  int res = ::kill (-signal_pid, SIGINT);
-+  int res = ::kill (signal_pid, SIGINT);
-   if (res == -1)
-     warning (_("Sending SIGINT to process group of pid %ld failed: %s"),
- 	     signal_pid, safe_strerror (errno));