- 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

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

- Backport patches to fix build failure caused by
  '--without-jbig2dec' and '--without-jbig2dec'.
  ...
  |make[1]: *** No rule to make target `obj/sjbig2_.dev',
  needed by `obj/sjbig2.dev'.  Stop.
  ...
  http://bugs.ghostscript.com/show_bug.cgi?id=696497

- Previously, it did not build the whole local libpng
  source in ghostscript, only picked up specific files
  and compile them. But on ghostscript 9.18, when the
  arm's FPU has been set to NEON (-mfpu=neon * with GCC),
  the selected file "libpng/pngrutil.c" needs to link
  'png_init_filter_functions_neon' which should be
  compiled by a non-selected file "libpng/arm/arm_init.c".
  ...
  |./obj/pngrutil.o: In function `png_init_filter_functions':
  |armv7a-neon-poky-linux-gnueabi/ghostscript/9.18-r0/build/../
  ghostscript-9.18/libpng/pngrutil.c:3921: undefined reference to
  `png_init_filter_functions_neon'
  ...
  So do not compile local libpng source in ghostscript,
  use shared libpng to instead.

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>