Hardcode runtime (libSystem) version to minimum possible
Hardcode runtime (libSystem) version to minimum possible

While we try to work out what the correlation between the OS and runtime
versions is, this commit hardcodes the latter to the minimum (compat)
version of 1.0.0.

Signed-off-by: Jakub Konka <6a6104c4f9eecd610ffe6bc75ff11e62c11e17d5@jakubkonka.com>

raulgrell/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,andrewrk/zig,raulgrell/zig,zig-lang/zig,zig-lang/zig,andrewrk/zig,raulgrell/zig