Revert "Remove arch loops from build scripts. (#889)"

This reverts commit 7ed329c11f.

extensions/clientprefs/AMBuilder

@@ -1,22 +1,24 @@
 # vim: set sts=2 ts=8 sw=2 tw=99 et ft=python:
 import os
 
-binary = SM.ExtLibrary(builder, 'clientprefs.ext', arch)
-binary.compiler.cxxincludes += [
-  os.path.join(SM.mms_root, 'core', 'sourcehook'),
-]
-if binary.compiler.family == 'gcc' or binary.compiler.family == 'clang':
-  binary.compiler.cxxflags += ['-fno-rtti']
-elif binary.compiler.family == 'msvc':
-  binary.compiler.cxxflags += ['/GR-']
+for arch in SM.archs:
+  binary = SM.ExtLibrary(builder, 'clientprefs.ext', arch)
+  binary.compiler.cxxincludes += [
+    os.path.join(SM.mms_root, 'core', 'sourcehook'),
+  ]
+  if binary.compiler.family == 'gcc' or binary.compiler.family == 'clang':
+    binary.compiler.cxxflags += ['-fno-rtti']
+  elif binary.compiler.family == 'msvc':
+    binary.compiler.cxxflags += ['/GR-']
 
-binary.sources += [
-  'extension.cpp',
-  'cookie.cpp',
-  'menus.cpp',
-  'natives.cpp',
-  'query.cpp',
-  '../../public/smsdk_ext.cpp'
-]
+  binary.sources += [
+    'extension.cpp',
+    'cookie.cpp',
+    'menus.cpp',
+    'natives.cpp',
+    'query.cpp',
+    '../../public/smsdk_ext.cpp'
+  ]
+
+  SM.extensions += [builder.Add(binary)]
 
-SM.extensions += [builder.Add(binary)]