formula_installer: improve empty installation detection

Use FormulaAuditor.audit_prefix_has_contents from audit.rb, which has
better logic.

Closes Homebrew/homebrew#47678.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Library/Homebrew/formula_installer.rb

@@ -8,6 +8,7 @@ require "caveats"
 require "cleaner"
 require "formula_cellar_checks"
 require "install_renamed"
+require "cmd/audit"
 require "cmd/postinstall"
 require "hooks/bottles"
 require "debrew"
@@ -572,7 +573,11 @@ class FormulaInstaller
       end
     end
 
-    raise "Empty installation" if Dir["#{formula.prefix}/*"].empty?
+    auditor = FormulaAuditor.new(formula)
+    auditor.audit_prefix_has_contents
+    unless formula.prefix.exist? && auditor.problems.empty?
+      raise "Empty installation"
+    end
 
   rescue Exception
     ignore_interrupts do