Missing flags in the manifest

[ale5000-git]

@mar-v-in I have compared the manifest of microG GmsCore and Google Play Services and this is what we are missing:

<manifest
	android:sharedUserId="com.google.uid.shared">

	<application
		android:requiredForAllUsers="true"
		android:restrictedAccountType="com.google"
		android:usesNonSdkApi="true">

sharedUserId and requiredForAllUsers may help to make it working for all users on the phone. restrictedAccountType make the account available also in restricted profiles.

So it possibly help with #1624 and #1253 although I'm not sure.