linkage_checker: skip files with incompatible architectures

Some formulae include these files, and they can't always be removed.
However, they can cause spurious linkage failures, so let's skip them
when checking for linkage. See, for example, faust at
Homebrew/homebrew-core#191308.

Library/Homebrew/extend/pathname.rb

@@ -469,6 +469,11 @@ class Pathname
     false
   end
 
+  sig { params(_wanted_arch: Symbol).returns(T::Boolean) }
+  def arch_compatible?(_wanted_arch)
+    false
+  end
+
   sig { returns(T::Array[String]) }
   def rpaths
     []

Library/Homebrew/linkage_checker.rb

@@ -115,6 +115,7 @@ class LinkageChecker
       @keg.find do |file|
         next if file.symlink? || file.directory?
         next if !file.dylib? && !file.binary_executable? && !file.mach_o_bundle?
+        next unless file.arch_compatible?(Hardware::CPU.arch)
 
         # weakly loaded dylibs may not actually exist on disk, so skip them
         # when checking for broken linkage

Library/Homebrew/os/linux/elf.rb

@@ -68,6 +68,12 @@ module ELFShim
     end
   end
 
+  def arch_compatible?(wanted_arch)
+    return true unless elf?
+
+    wanted_arch == arch
+  end
+
   def elf_type
     return :dunno unless elf?
 

Library/Homebrew/os/mac/mach.rb

@@ -155,6 +155,13 @@ module MachOShim
     arch == :ppc64
   end
 
+  def arch_compatible?(wanted_arch)
+    return true unless mach_data.present?
+    return arch == wanted_arch unless universal?
+
+    archs.include?(wanted_arch)
+  end
+
   def dylib?
     mach_data.any? { |m| m.fetch(:type) == :dylib }
   end