hostboot: Drop patch that is applied upstream

hostboot-0013-htmgt-Remove-unused-variable has been applied upstream as
of hostboot commit 72aa4a65f70deeab50390b5b3040cc04d24cde98 so we don't
need to patch it into the tree.

The upstream version had a different Gerrit commit ID, so it did not
automatically get dropped as it should have.

Note that a failing patch causes subsequent patches to not apply (see
https://github.com/open-power/op-build/issues/1194), but luckily this
was the last one.

Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/openpower/package/hostboot/p8Patches/hostboot-0013-htmgt-Remove-unused-variable.patch b/openpower/package/hostboot/p8Patches/hostboot-0013-htmgt-Remove-unused-variable.patch
deleted file mode 100644
index cc14cda..0000000
--- a/openpower/package/hostboot/p8Patches/hostboot-0013-htmgt-Remove-unused-variable.patch
+++ /dev/null
@@ -1,35 +0,0 @@
-From 64646f1205672650d9781c83a4aedaeb1664ce47 Mon Sep 17 00:00:00 2001
-From: Joel Stanley <joel.stanley@au1.ibm.com>
-Date: Mon, 21 Aug 2017 16:20:41 +0930
-Subject: [PATCH] hwpf: Remove unused variable
-
-Change-Id: Ica691bea7541fbd02d76400e94f8fbaf9a3e6517
-Signed-off-by: Joel Stanley <joel.stanley@au1.ibm.com>
----
- src/usr/hwpf/hwp/utility_procedures/p8_cpu_special_wakeup.C | 3 +--
- 1 file changed, 1 insertion(+), 2 deletions(-)
-
-diff --git a/src/usr/hwpf/hwp/utility_procedures/p8_cpu_special_wakeup.C b/src/usr/hwpf/hwp/utility_procedures/p8_cpu_special_wakeup.C
-index ee59c8066ccb..c0d6e8a1f2c2 100644
---- a/src/usr/hwpf/hwp/utility_procedures/p8_cpu_special_wakeup.C
-+++ b/src/usr/hwpf/hwp/utility_procedures/p8_cpu_special_wakeup.C
-@@ -5,7 +5,7 @@
- /*                                                                        */
- /* OpenPOWER HostBoot Project                                             */
- /*                                                                        */
--/* Contributors Listed Below - COPYRIGHT 2014                             */
-+/* Contributors Listed Below - COPYRIGHT 2014,2017                        */
- /* [+] International Business Machines Corp.                              */
- /*                                                                        */
- /*                                                                        */
-@@ -153,7 +153,6 @@ p8_cpu_special_wakeup(  const fapi::Target& i_ex_target,
-     uint32_t            count = 0;
- 
-     std::vector<fapi::Target>      l_chiplets;
--    std::vector<Target>::iterator  itr;
- 
-     uint8_t             oha_spwkup_flag = 0;
-     uint8_t             ignore_xstop_flag = 0;
--- 
-2.14.1
-