x11/wlrctl: unbreak build after b991d37c58ed
ld: error: undefined symbol: round
referenced by pointer.c
wlrctl.p/pointer.c.o:(prepare_pointer)referenced by pointer.c
wlrctl.p/pointer.c.o:(prepare_pointer)referenced by pointer.c
wlrctl.p/pointer.c.o:(prepare_pointer)referenced 1 more times
Reported by: pkg-fallout