[libguestfs] Remove upstream patch.

[Richard W.M. Jones]

commit 12055d2b2aaa5aaeb7d992b7a493bafb3edbcd64
Author: Richard W.M. Jones <rjones at redhat.com>
Date:   Wed Oct 10 11:20:58 2012 +0100

    Remove upstream patch.

 ...n-extended-workaround-for-btrfs-failures-.patch |   36 --------------------
 libguestfs.spec                                    |    4 --
 2 files changed, 0 insertions(+), 40 deletions(-)
---
diff --git a/libguestfs.spec b/libguestfs.spec
index 97b11bf..95f2d83 100644
--- a/libguestfs.spec
+++ b/libguestfs.spec
@@ -43,9 +43,6 @@ Patch2:        libguestfs-1.19.2-remove-udev-from-packagelist.patch
 # on i386 only.  This works around a bug in 32-bit qemu (RHBZ#857026).
 Patch3:        0001-i386-Add-noapic-flag-to-work-around-a-qemu-or-kernel.patch
 
-# Upstream patch to workaround btrfs problems with kernel 3.7.0.
-Patch4:        0001-btrfs-Add-an-extended-workaround-for-btrfs-failures-.patch
-
 %if 0%{?rhel} >= 7
 ExclusiveArch: x86_64
 %endif
@@ -697,7 +694,6 @@ autoreconf -i
 %endif
 %patch2 -p1
 %patch3 -p1
-%patch4 -p1
 
 mkdir -p daemon/m4