[heycam/webidl] Meta: fix Makefile escaping in fallback case (#801)

At least on Windows with Git Bash, this is necessary.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/801

-- Commit Summary --

  * Meta: fix Makefile escaping in fallback case

-- File Changes --

    M Makefile (2)

-- Patch Links --

https://github.com/heycam/webidl/pull/801.patch
https://github.com/heycam/webidl/pull/801.diff

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https://github.com/heycam/webidl/pull/801