eapi: add todo note for merging Eapi._from_obj() and Eapi.from_obj()

Once cython supports static cpdef methods.

Author: radhermit

src/pkgcraft/eapi.pyx

@@ -86,6 +86,7 @@ cdef class Eapi(Indirect):
         inst.ptr = ptr
         return inst
 
+    # TODO: merge with Eapi.from_obj() when static cpdef methods are supported
     @staticmethod
     cdef Eapi _from_obj(object obj):
         """Try to convert an object to an Eapi object."""