Simplify hook error status logic

The simplification here is due to a long-standing bug, but it is not
worth fixing the bug at this time. Instead we've finally written up an
issue for the bug, and referenced the issue number in the code.

Author: Ericson2314

src/libstore/build/derivation-goal.cc

@@ -930,28 +930,11 @@ Goal::Co DerivationGoal::hookDone()
 
         appendLogTailErrorMsg(worker, drvPath, logTail, msg);
 
-        auto e = BuildError(msg);
-
         outputLocks.unlock();
 
-        BuildResult::Status st = BuildResult::MiscFailure;
-
-#ifndef _WIN32
-        if (WIFEXITED(status) && WEXITSTATUS(status) == 101)
-            st = BuildResult::TimedOut;
-
-        else if (WIFEXITED(status) && WEXITSTATUS(status) == 100)
-        {
-            assert(derivationType);
-            st =
-                dynamic_cast<NotDeterministic*>(&e) ? BuildResult::NotDeterministic :
-                statusOk(status) ? BuildResult::OutputRejected :
-                !derivationType->isSandboxed() ? BuildResult::TransientFailure :
-                BuildResult::PermanentFailure;
-        }
-#endif
+        /* TODO (once again) support fine-grained error codes, see issue #12641. */
 
-        co_return done(st, {}, std::move(e));
+        co_return done(BuildResult::MiscFailure, {}, BuildError(msg));
     }
 
     /* Compute the FS closure of the outputs and register them as