gitignore: Add version_generated.h

.gitignore

@@ -3,7 +3,7 @@ core/global_defaults.cpp
 core/method_bind_ext.inc
 core/method_bind.inc
 core/script_encryption_key.cpp
-core/version.h
+core/version_generated.h
 drivers/gles2/shaders/*.h
 drivers/gles3/shaders/*.h
 drivers/unix/os_unix_global_settings_path.cpp