Makefile: add tailscale_go to the set of build tags

We build with the tailscale Go toolchain, so we should pass in the
build tag that indicates that it's safe to use functionality contained
within it.

Updates tailscale/corp#9230

Makefile

@@ -52,7 +52,7 @@ endif
 
 $(DEBUG_APK): toolchain
 	mkdir -p android/libs
-	go run gioui.org/cmd/gogio -buildmode archive -target android -appid $(APPID) -tags novulkan -o $(AAR) github.com/tailscale/tailscale-android/cmd/tailscale
+	go run gioui.org/cmd/gogio -buildmode archive -target android -appid $(APPID) -tags novulkan,tailscale_go -o $(AAR) github.com/tailscale/tailscale-android/cmd/tailscale
 	(cd android && ./gradlew test assemblePlayDebug)
 	mv android/build/outputs/apk/play/debug/android-play-debug.apk $@
 
@@ -65,7 +65,7 @@ rundebug: $(DEBUG_APK)
 # This is useful for testing on e.g. Amazon Fire Stick devices.
 tailscale-fdroid.apk: toolchain
 	mkdir -p android/libs
-	go run gioui.org/cmd/gogio -buildmode archive -target android -appid $(APPID) -tags novulkan -o $(AAR) github.com/tailscale/tailscale-android/cmd/tailscale
+	go run gioui.org/cmd/gogio -buildmode archive -target android -appid $(APPID) -tags novulkan,tailscale_go -o $(AAR) github.com/tailscale/tailscale-android/cmd/tailscale
 	(cd android && ./gradlew test assembleFdroidDebug)
 	mv android/build/outputs/apk/fdroid/debug/android-fdroid-debug.apk $@
 
@@ -73,7 +73,7 @@ tailscale-fdroid.apk: toolchain
 release_aar: toolchain
 release_aar:
 	mkdir -p android/libs
-	go run gioui.org/cmd/gogio -ldflags "-X tailscale.com/version.longStamp=$(VERSIONNAME) -X tailscale.com/version.shortStamp=$(VERSIONNAME_SHORT) -X tailscale.com/version.gitCommitStamp=$(TAILSCALE_COMMIT) -X tailscale.com/version.extraGitCommitStamp=$(OUR_VERSION)" -buildmode archive -target android -appid $(APPID) -tags novulkan -o $(AAR) github.com/tailscale/tailscale-android/cmd/tailscale
+	go run gioui.org/cmd/gogio -ldflags "-X tailscale.com/version.longStamp=$(VERSIONNAME) -X tailscale.com/version.shortStamp=$(VERSIONNAME_SHORT) -X tailscale.com/version.gitCommitStamp=$(TAILSCALE_COMMIT) -X tailscale.com/version.extraGitCommitStamp=$(OUR_VERSION)" -buildmode archive -target android -appid $(APPID) -tags novulkan,tailscale_go -o $(AAR) github.com/tailscale/tailscale-android/cmd/tailscale
 
 $(RELEASE_AAB): release_aar
 	(cd android && ./gradlew test bundlePlayRelease)