New compiler: Report the correct line number when encountering an unknown symbol

[fernewelten]

Fixes #2902

Fix bug: When reporting an undefined symbol, the compiler didn't report the line that the symbol itself was on, but the line of the preceding symbol.

Typical code:
func is unknown, this should be reported for the line 8, not 3

void game_start() // line 1
{
    int i; // line 3




    func(null); // line 8
}

[fernewelten]

The failing checks seem to be unrelated to the patch proper.