[OE-core] [PATCH] ghostscript: mostly rewrite recipe

From: Ross Burton This started as a patch cleanup but escalated rapidly. Remove unneeded patches: - mkdir-p.patch isn't needed now the Makefiles appear to have the correct dependencies. - ghostscript-9.15-parallel-make.patch appears to be unneeded for the same reason - base-genht.c-add-a-pre

Re: [OE-core] [PATCH] ghostscript: mostly rewrite recipe

Hello, This doesn't build on the AB: https://autobuilder.yoctoproject.org/typhoon/#/builders/117/builds/3055/steps/13/logs/errors https://autobuilder.yoctoproject.org/typhoon/#/builders/64/builds/7306/steps/11/logs/errors https://autobuilder.yoctoproject.org/typhoon/#/builders/45/builds/7327/step