Python: move remaining python files to C++

Also see #103343.

Pull Request: https://projects.blender.org/blender/blender/pulls/110352

source/blender/python/gpu/gpu_py_texture.h

@@ -10,6 +10,10 @@
 
 #include "BLI_compiler_attrs.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern PyTypeObject BPyGPUTexture_Type;
 
 #define BPyGPUTexture_Check(v) (Py_TYPE(v) == &BPyGPUTexture_Type)
@@ -24,3 +28,7 @@ PyObject *bpygpu_texture_init(void);
 
 PyObject *BPyGPUTexture_CreatePyObject(struct GPUTexture *tex, bool shared_reference)
     ATTR_NONNULL(1);
+
+#ifdef __cplusplus
+}
+#endif