Apps that expect to use the current SDK don't specify anything in their
manifest and the build system rightfully injects the current SDK.
Any apps that specify their own <uses-sdk> or versionCode are telling
the build system that they are purposely using some other minSdkVersion,
etc (support library demos).
Test: None
Change-Id: I0aba3a71e15703c7bcafcf4d35608a1851dd8567
Fixes: 34901699