Fix several minor warnings

Source/UnitTests/Common/FileUtilTest.cpp

@@ -24,7 +24,7 @@ protected:
     }
   }
 
-  void SetUp()
+  void SetUp() override
   {
     if (m_parent_directory.empty())
     {

Source/UnitTests/Core/IOS/ES/FormatsTest.cpp

@@ -44,7 +44,7 @@ TEST(TMDReader, Validity)
 class TMDReaderTest : public ::testing::Test
 {
 protected:
-  virtual void SetUp() = 0;
+  void SetUp() override = 0;
 
   // Common tests.
   void TestGeneralInfo();

Source/UnitTests/Core/IOS/FS/FileSystemTest.cpp

@@ -41,7 +41,7 @@ protected:
     m_fs.reset();
     File::DeleteDirRecursively(m_profile_path);
   }
-  void SetUp()
+  void SetUp() override
   {
     if (UserDirectoryCreationFailed())
     {