cmd/gomobile: fix tests

Forgot to update tests on macOS after CL 102915.

Change-Id: I902fd1046434d133129a0cd82bc28c3f7ee47816
Reviewed-on: https://go-review.googlesource.com/104455
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
diff --git a/cmd/gomobile/build_darwin_test.go b/cmd/gomobile/build_darwin_test.go
index 3434952..ec39119 100644
--- a/cmd/gomobile/build_darwin_test.go
+++ b/cmd/gomobile/build_darwin_test.go
@@ -78,7 +78,9 @@
 echo "{{.Xcontents}}" > $WORK/main/Images.xcassets/AppIcon.appiconset/Contents.json
 GOARM=7 GOOS=darwin GOARCH=arm CC=clang-iphoneos CXX=clang-iphoneos CGO_CFLAGS=-isysroot=iphoneos -miphoneos-version-min=6.1 -arch armv7 CGO_LDFLAGS=-isysroot=iphoneos -miphoneos-version-min=6.1 -arch armv7 CGO_ENABLED=1 go build -tags tag1 ios -x -o=$WORK/arm golang.org/x/mobile/example/basic
 GOOS=darwin GOARCH=arm64 CC=clang-iphoneos CXX=clang-iphoneos CGO_CFLAGS=-isysroot=iphoneos -miphoneos-version-min=6.1 -arch arm64 CGO_LDFLAGS=-isysroot=iphoneos -miphoneos-version-min=6.1 -arch arm64 CGO_ENABLED=1 go build -tags tag1 ios -x -o=$WORK/arm64 golang.org/x/mobile/example/basic
-xcrun lipo -create $WORK/arm $WORK/arm64 -o $WORK/main/main
+GOOS=darwin GOARCH=386 CC=clang-iphonesimulator CXX=clang-iphonesimulator CGO_CFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=6.1 -arch i386 CGO_LDFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=6.1 -arch i386 CGO_ENABLED=1 go build -tags tag1 ios -x -o=$WORK/386 golang.org/x/mobile/example/basic
+GOOS=darwin GOARCH=amd64 CC=clang-iphonesimulator CXX=clang-iphonesimulator CGO_CFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=6.1 -arch x86_64 CGO_LDFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=6.1 -arch x86_64 CGO_ENABLED=1 go build -tags tag1 ios -x -o=$WORK/amd64 golang.org/x/mobile/example/basic
+xcrun lipo -o $WORK/main/main -create $WORK/arm $WORK/arm64 $WORK/386 $WORK/amd64
 mkdir -p $WORK/main/assets
 xcrun xcodebuild -configuration Release -project $WORK/main.xcodeproj -allowProvisioningUpdates DEVELOPMENT_TEAM={{.TeamID}}
 mv $WORK/build/Release-iphoneos/main.app basic.app