build.zig: libuserland expects to against libc

Author: andrewrk

build.zig

@@ -389,6 +389,7 @@ fn addLibUserlandStep(b: *Builder) void {
     else
         b.addStaticLibrary("userland", "src-self-hosted/stage1.zig");
     artifact.disable_gen_h = true;
+    artifact.linkSystemLibrary("c");
     const libuserland_step = b.step("libuserland", "Build the userland compiler library for use in stage1");
     libuserland_step.dependOn(&artifact.step);