Silence `-Wcast-function-type` warning #2840

Job	Run time
Lint	47s
ARM [GOAL install] [buster]	12m 5s
macOS 12 native [GOAL install] [GUI] [no depends]	23m 47s
Win32	13m 45s
Win64	31m 9s
i386 Linux [GOAL install] [focal]	11m 45s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	15m 54s
x86_64 Linux [GOAL install] [GUI] [bionic] [no depends]	14m 36s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [focal]	28m 30s
	2h 32m 18s

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