* gnu/packages/ghostscript.scm (ghostscript/fixed): New variable.
(ghostscript)[replacement]: Assign it to new field.
* gnu/packages/patches/ghostscript-CVE-2023-36664.patch,
gnu/packages/patches/ghostscript-CVE-2023-36664-fixup.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.