Remove dependency on more-asserts (#4408)

* Remove dependency on `more-asserts`

In my recent adventures to do a bit of gardening on our dependencies I
noticed that there's a new major version for the `more-asserts` crate.
Instead of updating to this though I've opted to instead remove the
dependency since I don't think we heavily lean on this crate and
otherwise one-off prints are probably sufficient to avoid the need for
pulling in a whole crate for this.

* Remove exemption for `more-asserts`

crates/test-programs/build.rs

@@ -48,6 +48,7 @@ mod wasi_tests {
     fn build_tests(testsuite: &str, out_dir: &Path) -> io::Result<()> {
         let mut cmd = Command::new("cargo");
         cmd.env("CARGO_PROFILE_RELEASE_DEBUG", "1");
+        cmd.env_remove("CARGO_ENCODED_RUSTFLAGS");
         cmd.args(&[
             "build",
             "--release",