[Issue 17887] New: Add WebAssembly predefined version

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17887

          Issue ID: 17887
           Summary: Add WebAssembly predefined version
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: petar.p.kirov at gmail.com

The first step to WebAssembly support is adding a predefined version, so
libraries can adapt (for example the D bindings for SDL2). It is yet to be
determined if more parts of the language can be used in addition to the betterC
subset, so this may or may not be used in druntime for implementing full
run-time support.

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