bugfix: fix `org-babel-execute-src-block' on remote hosts
* lisp/ob-core.el (org-babel-temp-file): For remote hosts, modify the prefix
and leave `temporary-file-directory' unchanged.
The reason setting `temporary-file-directory' doesn't work here is
because `make-temp-file' recursively calls itself (indirectly).
Modifying `temporary-file-directly', affects the recursive calls as well,
which results in a "No such file file or directory" error.
The fix is to leave `temporary-file-directory' unaltered, for remote
hosts, and instead modifying the 'prefix' argument to `make-temp-file'
appropriately.
TINYCHANGE