Fuse4x: Tweak universal binary settings

Make sure that 64 bit builds aren't attempted on older Intel Macs.

Fixes Homebrew/homebrew#7713.

Formula/fuse4x-kext.rb

@@ -22,7 +22,7 @@ class Fuse4xKext < Formula
       "SYMROOT=build",
       # Build a 32-bit kernel extension on Leopard and a fat binary for Snow
       # Leopard/Lion.
-      "ARCHS=i386 #{'x86_64' unless MacOS.leopard?}", 'ONLY_ACTIVE_ARCH=NO'
+      "ARCHS=i386 #{'x86_64' if MacOS.prefer_64_bit?}", 'ONLY_ACTIVE_ARCH=NO'
     ]
 
     system "/usr/bin/xcodebuild", *args

Formula/fuse4x.rb

@@ -9,11 +9,16 @@ class Fuse4x < Formula
   depends_on 'fuse4x-kext'
 
   def install
+    # Build universal if the hardware can handle it---otherwise 32 bit only
+    MacOS.prefer_64_bit? ? ENV.universal_binary : ENV.m32
     gettext = Formula.factory('gettext')
 
+    # Don't hardwire a universal binary build in the CFLAGS and LDFLAGS
+    # see issue #7713
+    inreplace 'configure.in', '-arch i386 -arch x86_64', ''
     ENV['ACLOCAL'] = "/usr/bin/aclocal -I#{gettext.share}/aclocal"
-
     system "autoreconf", "--force", "--install"
+
     system "./configure", "--disable-dependency-tracking", "--disable-debug", "--disable-static", "--prefix=#{prefix}"
     system "make install"
   end