Use `<iosfwd>` instead of `<iostream>`

bytecodealliance / wasmtime-cpp

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Use `<iosfwd>` instead of `<iostream>` #19

Closed alexcrichton closed 3 years ago

alexcrichton commented 3 years ago

Looks like this header is intended to compile much faster and bring in less bloat, and there's no other reason to bring in <iostream> so use <iosfwd> instead.

Closes #18