[Issue 17787] Add a BetterC predefined version so libraries can adapt

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17787

--- Comment #5 from github-bugzilla at puremagic.com ---
Commits pushed to stable at https://github.com/dlang/dlang.org

https://github.com/dlang/dlang.org/commit/30f3b8e062b0a497aa45368fdc35757851cbf0df
fix Issue 17787 - Add a BetterC predefined version so libraries can adapt

https://github.com/dlang/dlang.org/commit/0eaa9c4c303342a169defbd3c8cbc1d20eb35743
Merge pull request #1892 from WalterBright/D_betterC

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