Generate compilable code for array inits

[LemonBoy]

The compiler still doesn't like too much the newfangled anonymous arrays
so let's use the old-style declarations.

Closes #4181

[andrewrk]

sr.ht has shit the bed, but there is also a legitimate failure here:

========= Expected to find: ===================
pub const uuid_t = [16]u8;
pub const UUID_NULL: uuid_t = .{
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
};
========= But file does not contain it: =======
pub const uuid_t = [16]u8;
pub const UUID_NULL: uuid_t = [16]u8{
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
    @bitCast(u8, @truncate(i8, @as(c_int, 0))),
};

I think you will catch this locally with test-translate-c

[LemonBoy]

sr.ht has shit the bed, but there is also a legitimate failure here:

I routinely forget to git add the test cases once I modify them, sorry for the delay.