Suppress a clang 12 warning about "suspicious concatenation".
My clang doesn't like it when we write code like this:
char *list[] = {
"abc",
"def",
"ghi"
"jkl"
}
It wonders whether we meant to put a comma between "ghi" and "jkl" or not, and gives a warning.
To suppress this warning (since in this case, we did mean to omit the comma), we just wrap the two strings in parentheses.
Closes #40426 (closed); bugfix on 0.4.0.4-rc.