修复availableProcessors，潜在的native方法获取CPU个数失败的问题

hutool-core/src/test/java/cn/hutool/core/util/RuntimeUtilTest.java

@@ -43,4 +43,11 @@ public class RuntimeUtilTest {
 		int pid = RuntimeUtil.getPid();
 		Assert.assertTrue(pid > 0);
 	}
+
+	@Test
+	public void getProcessorCountTest(){
+		int cpu = RuntimeUtil.getProcessorCount();
+		Console.log("cpu个数：{}", cpu);
+		Assert.assertTrue(cpu > 0);
+	}
 }