deno: depend on gcc for Linux

[iMichka]

Fixes:
Undeclared dependencies with linkage:
gcc

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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[iMichka]

Seen in #90594

[carlocab]

I think you can make this syntax-only.

[BrewTestBot]

🤖 A scheduled task has triggered a merge.