Add WERROR option to CMake build (#982)
Add WERROR option to CMake build (#982)

We shouldn't compile with `-Werror` or `-WX` by default, it is useful
for wabt developers but hostile to users.

Fixes issue #980.
WebAssembly/sexpr-wasm-prototype,WebAssembly/wabt,WebAssembly/sexpr-wasm-prototype,WebAssembly/sexpr-wasm-prototype,WebAssembly/wabt,WebAssembly/sexpr-wasm-prototype,WebAssembly/sexpr-wasm-prototype,WebAssembly/sexpr-wasm-prototype,WebAssembly/wabt,WebAssembly/wabt,WebAssembly/wabt