It has happened repeatedly that C++ code accidentally crept into the GDExtension C header, a notable example being use of the `bool` type. This change adds a CI step to check the header with a C-only compiler.
It has happened repeatedly that C++ code accidentally crept into the GDExtension C header, a notable example being use of the `bool` type. This change adds a CI step to check the header with a C-only compiler.