The inclusion loop detection does not work

[lupino3]

The file inclusion feature (#include directive) has some code to detect inclusion loops, but it doesn't work.

Adding a simple test case in the following form is enough to expose the bug:

include-1.s

#include include-2.s

.code:
    syscall 0

include-2.s

#include include-1.s

.code:
    syscall 0