warning instead of error for invalid icc #92

Job	Run time
.deb packages / ubuntu:22.04	5m 51s
Release linux x86_64 static	2m 52s
.deb packages / ubuntu:20.04	5m 20s
.deb packages / debian:bullseye	5m 12s
Windows Build (vcpkg / x86-windows-static)	4m 36s
.deb packages / debian:bookworm	5m 39s
Windows Build (vcpkg / x64-windows-static)	4m 38s
.deb packages / debian:trixie	1m 15s
Windows Build (vcpkg / x86-windows)	3m 4s
.deb packages / debian:sid	5m 17s
Windows Build (vcpkg / x64-windows)	2m 44s
	46m 28s

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