ENV/super: use Hardware::CPU.is_32_bit?

`Hardware.is_32_bit?` is deprecated.

Library/Homebrew/extend/ENV/super.rb

@@ -277,7 +277,7 @@ module Superenv
     self["HOMEBREW_ARCHFLAGS"] = Hardware::CPU.universal_archs.as_arch_flags
 
     # GCC doesn't accept "-march" for a 32-bit CPU with "-arch x86_64"
-    if compiler != :clang && Hardware.is_32_bit?
+    if compiler != :clang && Hardware::CPU.is_32_bit?
       self["HOMEBREW_OPTFLAGS"] = self["HOMEBREW_OPTFLAGS"].sub(
         /-march=\S*/,
         "-Xarch_#{Hardware::CPU.arch_32_bit} \\0"