ghostscript: bump version to 9.22

ghostscript: bump version to 9.22

Remove patches that has been merged/updated upstream

0002-Host-tool-mkromfs_1-needs-libz.patch
-> http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=284f5fe121d8eb0a0f50a6f2465ee2f99a061018
0003-Bug-697799-have-.eqproc-check-its-parameters.patch
-> http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=4f83478c88c2e05d6e8d79ca4557eb039354d2f3
   http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=57f20719e1cfaea77b67cb26e26de7fe4d7f9b2e
   http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=ccfd2c75ac9be4cbd369e4cbdd40ba11a0c7bdad
0004-Bug-697799-have-.rsdparams-check-its-parameters
-> http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=04b37bbce174eed24edec7ad5b920eb93db4d47d
   http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=ccfd2c75ac9be4cbd369e4cbdd40ba11a0c7bdad

Signed-off-by: Olivier Schonken <olivier.schonken@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>