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Test case:
```
$ cmake . -DRUN_IN_PLACE=TRUE -DCMAKE_BUILD_TYPE=Release -DBUILD_SERVER=TRUE -DENABLE_TOUCH=FALSE
minetest minetestserver
W/o LTO: 13M 7.3M
W/ LTO: 11M 5.9M
difference: 15% 19%
```
Also fixes various compiler warnings resulting from compilation using LTO.
---------
Signed-off-by: David Heidelberg <david@ixit.cz>