Replace /home/lvuser with /home/systemcore (#8002)

wpiutil/src/main/native/cpp/jni/WPIUtilJNI.cpp

@@ -128,8 +128,8 @@ JNIEXPORT void JNICALL
 Java_edu_wpi_first_util_WPIUtilJNI_enableMockTime
   (JNIEnv*, jclass)
 {
-#ifdef __FRC_ROBORIO__
-  wpi::print(stderr, "WPIUtil: Mocking time is not available on the Rio\n");
+#ifdef __FRC_SYSTEMCORE__
+  wpi::print(stderr, "WPIUtil: Mocking time is not available on systemcore\n");
 #else
   mockTimeEnabled = true;
   wpi::SetNowImpl([] { return mockNow; });

wpiutil/src/main/native/cpp/sendable/SendableRegistry.cpp

@@ -71,7 +71,7 @@ static SendableRegistryInst& GetInstance() {
   return *GetInstanceHolder();
 }
 
-#ifndef __FRC_ROBORIO__
+#ifndef __FRC_SYSTEMCORE__
 namespace wpi::impl {
 void ResetSendableRegistry() {
   std::make_unique<SendableRegistryInst>().swap(GetInstanceHolder());