asyn

Change cast to work on Windows where timeval is defined differently f… #151

Job	Run time
ubuntu-latest/deps2/7.0/gcc/default/	2m 54s
ubuntu-latest/deps2/7.0/gcc/static/	2m 34s
ubuntu-latest/deps2/7.0/gcc/static/	2m 40s
ubuntu-latest/no-deps/3.15/gcc/default/	1m 46s
ubuntu-latest/deps2/3.15/gcc/static/	2m 24s
windows-2019/deps2/7.0/vs2019/default/	9m 23s
windows-2019/deps2/7.0/vs2019/static/	9m 32s
ubuntu-latest/no-deps/7.0/gcc/default/[email protected]	4m 1s
ubuntu-latest/no-deps/7.0/gcc/default/[email protected]	3m 56s
	39m 10s

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