Missing Header Files: `i106_can.h` and `i106_ethernet.h`

[DigitalInBlue]

The source files src/i106_can.c and src/i106_ethernet.c include headers that are missing from the repository:

#include "i106_can.h"
#include "i106_ethernet.h"

This causes the project to fail to compile:

i106_can.c
i106_ethernet.c
C:\source\libirig106\src\i106_can.c(15,10): error C1083: Cannot open include file: 'i106_can.h': No such file or directory
C:\source\libirig106\src\i106_ethernet.c(12,10): error C1083: Cannot open include file: 'i106_ethernet.h': No such file or directory

Please include the missing headers or remove the references if they're obsolete. Let me know if you'd like a patch PR.