Excplicitly set the user write bit when initializing the gifs or math
directories from the skeletons installed in the store. See also upstream
discussion at <https://github.com/dybvig/stex/pull/6>. This problem
would be exposed by the upcoming changes to Racket's build system.
* gnu/packages/patches/stex-copy-from-immutable-store.patch: New patch.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/chez.scm (stex-bootstrap)[patches]: Use it.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
