Compile polkadot-runtime both for Wasm ad native, allowing for testing and direct usage.

substrate/wasm-runtime/pwasm-libc/README.md

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+# pwasm-libc
+
+Parity WASM contracts standard library libc bindings
+
+[Documentation](https://paritytech.github.io/pwasm-std/pwasm_libc/)
+
+# License
+
+`pwasm-libc` is primarily distributed under the terms of both the MIT
+license and the Apache License (Version 2.0), at your choice.
+
+See LICENSE-APACHE, and LICENSE-MIT for details.