Revert "Improve @-versioned formulae linking."

[sjackman]

Reverts #9009

==> brew audit --tap=brewsci/bio
Error: 2 problems in 2 formulae detected
brewsci/bio/seqan@2:
  * Formula has other versions so create a versioned alias:
      cd /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/brewsci/homebrew-bio/Aliases
      ln -s ../Formula/seqan@2.rb seqan@2@2
brewsci/bio/seqan@3:
  * Formula has other versions so create a versioned alias:
      cd /home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/brewsci/homebrew-bio/Aliases
      ln -s ../Formula/seqan@3.rb seqan@3@3
==> FAILED

https://github.com/brewsci/homebrew-bio/pull/1184/checks?check_run_id=1333247048#step:4:74

We’ll that’s a strange error message.

@MikeMcQuaid PR #9009 appears to have broken brew audit.

[sjackman]

This issue appears to affect only third-party taps due to to this if:

brew/Library/Homebrew/dev-cmd/audit.rb

Lines 265 to 266 in be4723f

	def audit_file
	if formula.core_formula? && @versioned_formula

[sjackman]

$ brew audit brewsci/bio/seqan@3
brewsci/bio/seqan@3:
  * Formula has other versions so create a versioned alias:
      cd /usr/local/Homebrew/Library/Taps/brewsci/homebrew-bio/Aliases
      ln -s ../Formula/seqan@3.rb seqan@3@3
Error: 1 problem in 1 formula detected
$ git switch revert-9009-improve-versioned-linking
Branch 'revert-9009-improve-versioned-linking' set up to track remote branch 'revert-9009-improve-versioned-linking' from 'origin'.
Switched to a new branch 'revert-9009-improve-versioned-linking'
$ brew audit brewsci/bio/seqan@3 && echo good
good