Y offset lower unpegged textures in sky sectors

[hawkwind]

I thought you guys might be interested in this as it has a bearing with Eternity ...

https://forum.zdoom.org/viewtopic.php?f=3&t=54285

[andrewj]

Here is a test wad. The MODWALL3 texture should be aligned -- which it is in PrBoom software rendering and Chocolate Doom.

http://oblige.sourceforge.net/files/lower_test.zip

I will fix Eureka's renderer soon.

P.S. updated the wad with two maps, first one has higher sky ceiling on the back, second one has lower sky ceiling at the back.