Remove arch loops from build scripts. (#889)

This simplifies non-sdk build scripts by removing their loops over SM.archs. Instead the top-level
build script will re-evaluate them for each architecture.

extensions/curl/AMBuilder

@@ -2,27 +2,26 @@
 import os
 
 libcurl = builder.Build('curl-src/lib/AMBuilder')
-for arch in SM.archs:
-  binary = SM.ExtLibrary(builder, 'webternet.ext', arch)
-  binary.compiler.includes += [
-    os.path.join(builder.sourcePath, 'extensions', 'curl', 'curl-src', 'include')
-  ]
-  binary.compiler.defines += ['CURL_STATICLIB']
-  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.compiler.postlink += [libcurl[arch].binary]
-  if builder.target.platform == 'linux':
-    binary.compiler.postlink += ['-lrt']
-  elif builder.target.platform == 'windows':
-    binary.compiler.postlink += ['ws2_32.lib']
 
-  binary.sources += [
-    'extension.cpp',
-    'curlapi.cpp',
-    '../../public/smsdk_ext.cpp'
-  ]
+binary = SM.ExtLibrary(builder, 'webternet.ext', arch)
+binary.compiler.includes += [
+  os.path.join(builder.sourcePath, 'extensions', 'curl', 'curl-src', 'include')
+]
+binary.compiler.defines += ['CURL_STATICLIB']
+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.compiler.postlink += [libcurl[arch].binary]
+if builder.target.platform == 'linux':
+  binary.compiler.postlink += ['-lrt']
+elif builder.target.platform == 'windows':
+  binary.compiler.postlink += ['ws2_32.lib']
 
-  SM.extensions += [builder.Add(binary)]
+binary.sources += [
+  'extension.cpp',
+  'curlapi.cpp',
+  '../../public/smsdk_ext.cpp'
+]
 
+SM.extensions += [builder.Add(binary)]