app-emulation/docker: remove unnecessary patch for etcd

Now that Docker 20.10.13 updated its vendored etcd to 3.3.27, it is
not necessary any more to fix F_OFD_GETLK in etcd. Simply remove it.

sdk_container/src/third_party/coreos-overlay/app-emulation/docker/docker-20.10.13.ebuild

@@ -70,9 +70,7 @@ RESTRICT="installsources strip test"
 
 S="${WORKDIR}/${P}/src/${EGO_PN}"
 
-# https://bugs.gentoo.org/748984 https://github.com/etcd-io/etcd/pull/12552
 PATCHES=(
-	"${FILESDIR}/etcd-F_OFD_GETLK-fix.patch"
 	"${FILESDIR}/ppc64-buildmode.patch"
 )
 

sdk_container/src/third_party/coreos-overlay/app-emulation/docker/files/etcd-F_OFD_GETLK-fix.patch

@@ -1,28 +0,0 @@
-From ec81adb21605acd56b122bc35c53644b13d3ab7e Mon Sep 17 00:00:00 2001
-From: Moritz Both <mb@aldebaran.de>
-Date: Sun, 1 Nov 2020 23:20:12 +0100
-Subject: [PATCH] pkg/fileutil: fix constant for linux locking
-
-The constant F_OFD_GETLK is 36, not 37, according to
-/usr/include/bits/fcntl-linux.h
-Credits go to joakim-tjernlund who digged deep enough
-to find this.
-
-Fixes #31182
----
- pkg/fileutil/lock_linux.go | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/pkg/fileutil/lock_linux.go b/pkg/fileutil/lock_linux.go
-index 939fea62381..004d35fa23b 100644
---- a/vendor/github.com/coreos/etcd/pkg/fileutil/lock_linux.go
-+++ b/vendor/github.com/coreos/etcd/pkg/fileutil/lock_linux.go
-@@ -29,7 +29,7 @@ import (
- //
- // constants from /usr/include/bits/fcntl-linux.h
- const (
--	F_OFD_GETLK  = 37
-+	F_OFD_GETLK  = 36
- 	F_OFD_SETLK  = 37
- 	F_OFD_SETLKW = 38
- )