[SWIG] fix swig build warnings/errors on windows (#2141)

swig/lightgbmlib.i

@@ -160,7 +160,7 @@
       // int* indices0 = (int*)jenv->GetPrimitiveArrayCritical(indices, 0);
       // double* values0 = (double*)jenv->GetPrimitiveArrayCritical(values, 0);
       // in test-usecase an alternative to GetPrimitiveArrayCritical as it performs copies
-      int* indices0 = jenv->GetIntArrayElements(indices, 0);
+      int* indices0 = (int *)jenv->GetIntArrayElements(indices, 0);
       double* values0 = jenv->GetDoubleArrayElements(values, 0);
       
       jniCache.push_back({indices, values, indices0, values0, size});
@@ -187,7 +187,7 @@
       // jenv->ReleasePrimitiveArrayCritical(jc.values, jc.values0, JNI_ABORT);
       // jenv->ReleasePrimitiveArrayCritical(jc.indices, jc.indices0, JNI_ABORT);
       jenv->ReleaseDoubleArrayElements(jc.values, jc.values0, JNI_ABORT);
-      jenv->ReleaseIntArrayElements(jc.indices, jc.indices0, JNI_ABORT);
+      jenv->ReleaseIntArrayElements(jc.indices, (jint *)jc.indices0, JNI_ABORT);
    }
    
    return ret;