Fix func_friction #1252

Job	Run time
linux_libs	1m 57s
compile_sounds	52s
compile_tools	3m 42s
macOS_libs	2m 19s
windows_libs	4m 22s
compile_models	1m 17s
compile_wads	1m 9s
compile_sprites	46s
compile_addon_maps (quadfrost)	8m 53s
compile_maps (training)	1m 20s
compile_addon_maps (defroster)	3m 35s
compile_maps (stalkyard2)	59s
compile_maps (snowyard)	1m 0s
compile_maps (coldice)	1m 5s
compile_maps (canyon)	1m 2s
compile_maps (focus)	2m 20s
compile_maps (furrow)	1m 24s
compile_maps (training2)	1m 8s
compile_maps (bounce2)	1m 44s
compile_maps (catacombs)	1m 59s
compile_maps (fences)	45s
compile_maps (depot)	56s
compile_maps (snowcross)	1m 42s
compile_maps (frostfire)	2m 4s
compile_maps (drift)	1m 7s
compile_maps (snow_camp)	2m 44s
compile_maps (ice_pit)	1m 1s
compile_maps (frozen_bunker)	53s
compile_maps (snowtransit)	1m 1s
compile_maps (doublefrost)	1m 24s
compile_maps (themill)	2m 49s
compile_maps (chillworks)	1m 10s
compile_maps (frosty)	58s
compile_maps (overflow)	1m 55s
compile_maps (frozenwarehouse)	1m 21s
compile_maps (thechill)	56s
compile_maps (frostmill)	1m 21s
compile_maps (glupshitto)	50s
compile_maps (cold_base)	1m 0s
compile_maps (comet)	2m 48s
compile_maps (datafloe)	1m 13s
combine_maps	17s
package_coldice	2m 53s
	1h 16m 1s

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