Add AntTarget to vsandroid project file

[0x416c69]

What does this PR do?

Adds AntTarget to .androidproj files

How does this PR change Premake's behavior?

All the android builds used to be built targeting the debug mode, which adds android:debuggable=true, generates a different BuildConfig.java (Debug=true), etc.
This is unacceptable for release builds.

Anything else we should know?

I'm not sure when did VS add this option but I don't think adding this on older VS versions would hurt anything.

Did you check all the boxes?

• Focus on a single fix or feature; remove any unrelated formatting or code changes
• Add unit tests showing fix or feature works; all tests pass (There are no tests on AndroidAppLibName or many other elements on the android module and I don't know how to implement them)
• Mention any related issues (put closes #XXXX in comment to auto-close issue when PR is merged)
• Follow our coding conventions
• Minimize the number of commits
• Align documentation to your changes

[nickclark2016]

Can you add a corresponding unit test?

[0x416c69]

Unfortunately I don't know how, if there is a unit test for the "AndroidAppLibName" element which is already in there I could follow suit but I cannot find it...?

[samsinsane]

I'm going to merge this since we don't have unit tests for a lot of the Android module currently.