Githubactions: Windows: Remove unnecessary env variables #2235

Job	Run time
build on fedora:38 (gcc, false)	2m 4s
build on fedora:38 (clang, false)	2m 7s
build on fedora:37 (gcc, false)	2m 1s
build on fedora:37 (clang, false)	2m 13s
build on centos:7 (gcc, true)	1m 43s
build on ubuntu:23.10 (gcc,false)	1m 17s
build on ubuntu:23.10 (clang,false)	1m 47s
build on ubuntu:23.04 (gcc,false)	1m 21s
build on ubuntu:23.04 (clang,false)	1m 22s
build on ubuntu:22.04 (gcc,false)	1m 11s
build on ubuntu:22.04 (clang,true)	1m 29s
build on ubuntu:20.04 (gcc,false)	1m 22s
build on ubuntu:20.04 (clang,false)	1m 40s
build on ubuntu:18.04 (gcc,false)	1m 41s
build on ubuntu:16.04 (gcc,false)	1m 9s
build on ubuntu:14.04 (gcc,false)	1m 9s
build on debian:12 (gcc,false)	1m 26s
build on debian:12 (clang,false)	1m 27s
build on debian:11 (gcc,false)	1m 18s
build on debian:11 (clang,false)	1m 36s
build on macos (macos-latest)	40s
build on debian:10 (gcc,false)	1m 18s
build on macos (macos-latest-xlarge)	41s
run unit tests (ubuntu:22.04, clang)	11m 7s
run unit tests (centos:7, gcc)	9m 50s
	54m 59s

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