Clang/GCC compiler settings update [SECURITY] (#7358)

- Add the following compilation flags for clang
  -fpie
  -fstack-protector-all
  -fstack-check (non-release)

- Add the following compilation flags for gcc
  -fpie
  -fstack-protector-all

- Fix -Wunused-result errors from above compilation flag updates

- Add _FORTIFY_SOURCE=2 to GCC DEFINES

Signed-off-by: Steve Pham <82231385+spham-amzn@users.noreply.github.com>

Code/Framework/AzCore/Tests/Platform/Android/Tests/UtilsTests_Android.cpp

@@ -69,9 +69,11 @@ namespace UnitTest
         // Note that ConvertToAbsolutePath will perform a realpath on the result. The result of AZ::Utils::GetExecutableDirectory
         // uses AZ::Android::AndroidEnv::Get()->GetAppPrivateStoragePath() which will retrieve the storage path, but that path could
         // be symlinked, so we need to perform a real path on it before comparison
-        char realExecutableDirectory[AZ::IO::MaxPathLength];
-        ASSERT_TRUE(realpath(executableDirectory, realExecutableDirectory));
-
+        char* realExecutableDirectory = realpath(executableDirectory, nullptr);
+        ASSERT_NE(realExecutableDirectory, nullptr);
+        
         EXPECT_STRCASEEQ(realExecutableDirectory, absolutePath->c_str());
+
+        free(realExecutableDirectory);
     }
 }