Introduce a new CMake based build system for Wasm.
And target the Wasm ABI to wasm32-wasi, it should
be a more commnly used and standard ABI for Wasm.
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
Decouple the hello example into hello and hello_wasm. The hello_wasm
example is a minimal example to show how to build a wasm application
by using the NuttX build system, and avoid disturbing the hello
(native build).
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>