don't link -lc when building zig wasm hosts

crates/cli/tests/benchmarks/platform/host.zig

@@ -111,7 +111,7 @@ comptime {
 
 const Unit = extern struct {};
 
-pub fn main() u8 {
+pub export fn main() u8 {
     const stderr = std.io.getStdErr().writer();
 
     // The size might be zero; if so, make it at least 8 so that we don't have a nullptr

crates/compiler/build/src/link.rs

@@ -269,9 +269,6 @@ pub fn build_zig_host_wasm32(
             emit_bin,
             // include the zig runtime
             // "-fcompiler-rt",
-            // include libc
-            "--library",
-            "c",
             "-target",
             "wasm32-wasi",
             // "-femit-llvm-ir=/home/folkertdev/roc/roc/crates/cli/tests/benchmarks/platform/host.ll",