Clean up postgresql postFixup: remove debug output

The build failure is NOT a reference cycle — it's the Determinate Nix
daemon's orphaned store path bug on macOS (APFS). Outputs exist on disk
but fail to register in the Nix DB (.lock files present, nix path-info
says "not valid"). Confirmed on darwin-8: all 5 postgresql outputs are
orphaned despite sync-before-registering=true being deployed.

Keep the remove-references-to fix (strips dev ref from libecpg.so) as
a precaution against actual cycles, but the primary failure mode is the
daemon registration bug.

The changed postFixup produces a new drv hash, avoiding the FailedPaths
cache on hydra without manual DB cleanup.

Author: angerman

flake.nix

@@ -173,28 +173,17 @@
              outputChecks = {};
              separateDebugInfo = false;
              disallowedReferences = [];
-             # Break the dev↔lib reference cycle: dev naturally references
-             # lib (via .pc -L flags), but lib also picks up dev references
-             # through .la files and baked-in paths. Strip dev refs from lib
-             # since lib is a runtime output that doesn't need dev at runtime.
+             # Strip dev references from lib output: libecpg.so embeds a
+             # reference to $dev (via ecpg binary path). This would create
+             # a dev↔lib cycle since dev already references lib via .pc
+             # files. The lib output is runtime-only and doesn't need dev.
+             # Note: builds may still fail due to Determinate Nix daemon
+             # orphaned store path bug on macOS (APFS) — outputs exist on
+             # disk but fail to register in the Nix DB. This is independent
+             # of the reference cycle fix.
              postFixup = (old.postFixup or "") + ''
-               echo "=== postFixup: stripping dev refs from lib ==="
-               echo "lib=$lib"
-               echo "dev=$dev"
-               echo "Files in lib:"
-               find "$lib" -type f | head -20
-               # Delete .la files from lib — libtool archives embed absolute
-               # paths to dev headers/libs and are unnecessary for runtime.
                find "$lib" -name '*.la' -delete
-               # Check which files in lib reference dev before stripping.
-               echo "Files in lib referencing dev hash:"
-               DEV_HASH=$(echo "$dev" | sed 's|/nix/store/||; s|-.*||')
-               grep -rl "$DEV_HASH" "$lib" 2>/dev/null || echo "  (none found)"
-               # Strip any remaining references to $dev from the lib output.
                find "$lib" -type f -exec remove-references-to -t "$dev" {} +
-               echo "After stripping, files referencing dev hash:"
-               grep -rl "$DEV_HASH" "$lib" 2>/dev/null || echo "  (none found)"
-               echo "=== postFixup done ==="
              '';
            });
          });