ghostscript: drop the ijs subfolder to fix build

ghostscript: drop the ijs subfolder to fix build

The ijs/ subfolder contains a bogus ltmain.sh file, which is actually a
broken symbolic link. Due to this, our logic to patch ltmain.sh files
fail with some patch versions:

  >>> ghostscript 9.21 Patching libtool
  File /home/buildroot/build/instance-0/output/build/ghostscript-9.21/ijs/ltmain.sh is not a regular file -- refusing to patch

Since we are anyway not using the ijs support (--without-ijs is passed),
do like we do for all other sub-components of ghostscript: get rid of
the ijs/ subfolder completely.

Fixes:

  http://autobuild.buildroot.net/results/ca683d69b7fb564788c8877c3bb6466390e976a8/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>