gnu: racket: fix `raco exe` with non-minimal Racket

This commit backports an upstream repair for a bug exposed by Guix's
change in Racket 8.2 to make the `racket` package a layered/tethered
installation that chains to the `racket-minimal` package. When using a
layered/tethered installation, the `setup/variant` library would fail to
recognize the default Racet variant (CS, 3M, or CGC), leading to
confusing failures from `raco exe`, `create-embedding-executable`, and
other clients.

For further details, see <https://issues.guix.gnu.org/50118> and
<https://github.com/racket/racket/issues/3969>.

* gnu/packages/patches/racket-minimal-backport-1629887.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/racket.scm (racket-minimal)[source]: Use it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/gnu/local.mk b/gnu/local.mk
index 175e691a63..a7255e8df7 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1703,6 +1703,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/ripperx-missing-file.patch		\
   %D%/packages/patches/rpcbind-CVE-2017-8779.patch		\
   %D%/packages/patches/rtags-separate-rct.patch			\
+  %D%/packages/patches/racket-minimal-backport-1629887.patch    \
   %D%/packages/patches/racket-minimal-sh-via-rktio.patch	\
   %D%/packages/patches/remake-impure-dirs.patch			\
   %D%/packages/patches/restic-0.9.6-fix-tests-for-go1.15.patch	\