ghostscript: drop incorrectly applied patch

The patch was adding a change to the source file that was already there,
so the lines of code were repeated twice. This didn't create a bug or a
security issue, but it may well have.

Long story:
https://bugzilla.yoctoproject.org/show_bug.cgi?id=10450

(From OE-Core rev: 1fc1a5f392ec6773cd520cbbd19b58931c6a2d66)

Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/ghostscript/ghostscript/CVE-2016-7977.patch

@@ -1,33 +0,0 @@
-From 8abd22010eb4db0fb1b10e430d5f5d83e015ef70 Mon Sep 17 00:00:00 2001
-From: Chris Liddell <chris.liddell@artifex.com>
-Date: Mon, 3 Oct 2016 01:46:28 +0100
-Subject: [PATCH] Bug 697169: Be rigorous with SAFER permissions
-
-Once we've opened our input file from the command line, enforce the SAFER
-rules.
-
-Upstream-Status: Backport
-CVE: CVE-2016-7977
-
-Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
----
- psi/zfile.c | 3 +++
- 1 file changed, 3 insertions(+)
-
-diff --git a/psi/zfile.c b/psi/zfile.c
-index b6caea2..2c6c958 100644
---- a/psi/zfile.c
-+++ b/psi/zfile.c
-@@ -1081,6 +1081,9 @@ lib_file_open(gs_file_path_ptr  lib_path, const gs_memory_t *mem, i_ctx_t *i_ctx
-     gs_main_instance *minst = get_minst_from_memory(mem);
-     int code;
- 
-+    if (i_ctx_p && starting_arg_file)
-+        i_ctx_p->starting_arg_file = false;
-+
-     /* when starting arg files (@ files) iodev_default is not yet set */
-     if (iodev == 0)
-         iodev = (gx_io_device *)gx_io_device_table[0];
--- 
-2.10.2
-

meta/recipes-extended/ghostscript/ghostscript_9.21.bb

@@ -32,7 +32,6 @@ SRC_URI = "${SRC_URI_BASE} \
            file://ghostscript-9.02-genarch.patch \
            file://objarch.h \
            file://cups-no-gcrypt.patch \
-           file://CVE-2016-7977.patch \
            file://CVE-2017-7207.patch \
            file://CVE-2017-5951.patch \
            file://CVE-2017-7975.patch \