Add changelog

Author: sergv

changelog.d/pr-10990.md

@@ -0,0 +1,17 @@
+---
+synopsis: "Make cabal exec not pass extra -package-env argument"
+packages: [Cabal]
+prs: 10990
+---
+
+`cabal exec` started passing `-package-env=-` to all executables if
+underlying GHC supports env files. This makes the called executable
+fail if it doesn’t support the `-package-env` flag, which many
+executables don’t.
+
+This change restores old `cabal exec` behaviour to call regular
+executables without any extra command-line options and keeps fixes in
+PR 10828 that passes `-package-env` when dealing with GHC in other
+cabal commands. GHC is not typically called via `cabal exec` but the
+PR 10828 made other commands like `cabal build` pass the flag. This PR
+attempts to maintain that.