continuous integration

Update build-to-host.m4 to serial 4 #704

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Run time

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Job	Run time
clang_debug	7m 48s
mac-meson	4m 39s
emsdk	6m 30s
dist	11m 52s
meson	6m 11s
msys2	31m 22s
normal	8m 52s
tcc	2m 50s
	1h 20m 4s