[tests] adjust shell syntax in tests/prepare.sh #2
pr.yml
on: push
Linux-gcc
25s
Linux-clang
31s
macOS
29s
DragonflyBSD
3m 12s
FreeBSD
3m 8s
NetBSD
2m 55s
OpenBSD
3m 26s
Matrix: Windows-MSYS2
Matrix: Windows-VisualStudio