Avoid a print loop when busy-waiting on the client lock on Windows.

Compare with blaze_util_posix.cc.

PiperOrigin-RevId: 692927012
Change-Id: Ibd7f44ec288c436e891157c82c1b5484c7e5c0f7

src/main/cpp/blaze_util_windows.cc

@@ -1106,17 +1106,19 @@ uint64_t AcquireLock(const blaze_util::Path& output_base, bool batch_mode,
     }
     if (GetLastError() == ERROR_SHARING_VIOLATION) {
       // Someone else has the lock.
-      BAZEL_LOG(USER) << "Another command holds the client lock";
+      if (first_lock_attempt) {
+        first_lock_attempt = false;
+        BAZEL_LOG(USER) << "Another command holds the client lock.";
+        if (block) {
+          BAZEL_LOG(USER) << "Waiting for it to complete...";
+        }
+        fflush(stderr);
+      }
       if (!block) {
         BAZEL_DIE(blaze_exit_code::LOCK_HELD_NOBLOCK_FOR_LOCK)
             << "Exiting because the lock is held and --noblock_for_lock was "
                "given.";
       }
-      if (first_lock_attempt) {
-        first_lock_attempt = false;
-        BAZEL_LOG(USER) << "Waiting for it to complete...";
-        fflush(stderr);
-      }
       Sleep(/* dwMilliseconds */ 200);
     } else {
       string err = GetLastErrorString();