ghostscript: 9.21 -> 9.23

1. Drop backported patches
- CVE-2017-7207.patch
- CVE-2017-5951.patch
- CVE-2017-7975.patch
- CVE-2017-9216.patch
- CVE-2017-9611.patch
- CVE-2017-9612.patch
- CVE-2017-9739.patch
- CVE-2017-9726.patch
- CVE-2017-9727.patch
- CVE-2017-9835.patch
- CVE-2017-11714.patch

2. Rebase to 9.23
- ghostscript-9.15-parallel-make.patch
- ghostscript-9.16-Werror-return-type.patch
- do-not-check-local-libpng-source.patch
- avoid-host-contamination.patch
- mkdir-p.patch
- ghostscript-9.21-prevent_recompiling.patch
- ghostscript-9.02-genarch.patch
- cups-no-gcrypt.patch
- ghostscript-9.21-native-fix-disable-system-libtiff.patch
- base-genht.c-add-a-preprocessor-define-to-allow-fope.patch

3. Add packps from (native to target) to support cross compiling.

4. Add remove-direct-symlink.patch to fix
   do_populate_sysroot failure

(From OE-Core rev: f8b4636472c6784fb78ca09a7dd7ebe53011f631)

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/ghostscript/files/do-not-check-local-libpng-source.patch

@@ -1,7 +1,7 @@
-From 5ef8b85bc98f3bd9a15d5f47e24d3e23ae27c265 Mon Sep 17 00:00:00 2001
+From a954bf29a5f906b3151dffbecb5856e02e1565da Mon Sep 17 00:00:00 2001
 From: Hongxu Jia <hongxu.jia@windriver.com>
 Date: Mon, 18 Jan 2016 01:00:30 -0500
-Subject: [PATCH] configure.ac: do not check local png source
+Subject: [PATCH 03/10] configure.ac: do not check local png source
 
 In oe-core, it did not need to compile local libpng
 source in ghostscript, so do not check local png
@@ -16,10 +16,10 @@ Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
  1 file changed, 2 insertions(+), 2 deletions(-)
 
 diff --git a/configure.ac b/configure.ac
-index bf6d3f5..01df03f 100644
+index 9341930..80a60b1 100644
 --- a/configure.ac
 +++ b/configure.ac
-@@ -930,11 +930,11 @@ AC_SUBST(ZLIBDIR)
+@@ -1114,11 +1114,11 @@ AC_SUBST(ZLIBDIR)
  AC_SUBST(FT_SYS_ZLIB)
  
  dnl png for the png output device; it also requires zlib
@@ -34,5 +34,5 @@ index bf6d3f5..01df03f 100644
          SHARE_LIBPNG=0
          LIBPNGDIR=$srcdir/libpng
 -- 
-2.8.1
+1.8.3.1