Don't install zig_cpp lib for stage2 target
Don't install zig_cpp lib for stage2 target

Missed in last commit. See #2220.

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