Fix postgresql-musl: strip dev refs from out AND lib outputs

The real reference cycle is dev↔out (not dev↔lib as previously thought):
- dev references out via .pc -L flags
- out references dev via baked-in paths in binaries

Building on hydra (standard Nix, ext4) confirmed:
  "cycle detected in references of output 'dev' from output 'out'"

On darwin builders (Determinate Nix, APFS), this manifests as orphaned
store paths instead of a clean error: outputs exist on disk but daemon
fails to register them in the Nix DB.

Fix: strip dev references from BOTH out and lib outputs in postFixup,
since neither needs dev at runtime. Also remove .la files which embed
dev paths.

Author: angerman

flake.nix

@@ -173,15 +173,13 @@
              outputChecks = {};
              separateDebugInfo = false;
              disallowedReferences = [];
-             # Strip dev references from lib output: libecpg.so embeds a
-             # reference to $dev (via ecpg binary path). This would create
-             # a dev↔lib cycle since dev already references lib via .pc
-             # files. The lib output is runtime-only and doesn't need dev.
-             # Note: builds may still fail due to Determinate Nix daemon
-             # orphaned store path bug on macOS (APFS) — outputs exist on
-             # disk but fail to register in the Nix DB. This is independent
-             # of the reference cycle fix.
+             # Break the dev↔out reference cycle: dev references out (via
+             # .pc -L flags), and out references dev (via baked-in paths
+             # in binaries/libs). Strip dev refs from both out and lib
+             # outputs since neither needs dev at runtime.
              postFixup = (old.postFixup or "") + ''
+               find "$out" -name '*.la' -delete
+               find "$out" -type f -exec remove-references-to -t "$dev" {} +
                find "$lib" -name '*.la' -delete
                find "$lib" -type f -exec remove-references-to -t "$dev" {} +
              '';