faf52f953b47aac6a39892b037eaa3f08d46b655 tests: Drop variadic macro (MarcoFalke)
Pull request description:
The C++11 constructor of `std::vector` that takes an initializer list, is not `explicit`. Thus, the macro is not required and can be dropped.
Hopefully fixes #13456
Tree-SHA512: 4095ed205f88138a7cd5b14790cc426899966f622a924a9b3f7de646a0d801a48ffb8921da760f1f93d5481298477c8a64dbec291381bb9aa77b075bdd2659f2
Backport of Core PR13457