ghostscript: upgrade to 9.19

- Ghostscript and GhostPDL releases from version 9.19 have been moved to GitHub
  hosting, tweak download site

- Drop 0001-Bug-696497-Fix-support-for-building-with-no-jbig2-de.patch, and
  0002-Bug-696497-part-2-fix-support-for-building-with-a-JP.patch, ghostscript
  9.19 has fixed them.

- Fix QA Warning unrecognised options: --enable-little-endian. It use AC_C_BIGENDIAN
  to detect big/little endian.
  http://www.delorie.com/gnu/docs/autoconf/autoconf_64.html

(From OE-Core rev: 227ca0a373b5a93602a419296ff1da1a96615ba2)

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

@@ -16,17 +16,17 @@ 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 ab30a97..b762fd7 100644
+index bf6d3f5..01df03f 100644
 --- a/configure.ac
 +++ b/configure.ac
-@@ -955,11 +955,11 @@ AC_SUBST(ZLIBDIR)
+@@ -930,11 +930,11 @@ AC_SUBST(ZLIBDIR)
  AC_SUBST(FT_SYS_ZLIB)
  
  dnl png for the png output device; it also requires zlib
 -LIBPNGDIR=src
 +LIBPNGDIR=$srcdir/libpng
  PNGDEVS=''
- PNGDEVS_ALL='png48 png16m pnggray pngmono png256 png16 pngalpha'
+ PNGDEVS_ALL='png48 png16m pnggray pngmono pngmonod png256 png16 pngalpha'
  AC_MSG_CHECKING([for local png library source])
 -if test -f $srcdir/libpng/pngread.c; then
 +if false; then
@@ -34,5 +34,5 @@ index ab30a97..b762fd7 100644
          SHARE_LIBPNG=0
          LIBPNGDIR=$srcdir/libpng
 -- 
-1.9.1
+2.8.1