Missing parts of large sprites
nmlc r1872 (self-compiled, unmodified, Windows)
Parts of 'large' sprites are missing when compiled with nmlc. Seems similar to the issue fixed by r1662.
Test case: all preview sprites in OpenGFX+Airports have this issue, except for the heliport and helidepot. The input sprites are ok, but ingame some areas are missing.
Fix #3785: Fix tile compression to remove some useless (for grfv2) code and add a missing check for the chunk length.