Remove @EnableStrictI18N and @DisableStrictI18N.

This feature is provided by the linter included in AndroidStudio.
Remove @WithConstantInt and @WithConstantString.
Set ro.build.date.utc in ShadowSystemProperties.

Fixes #1251.
Merge pull request #1381 from erd/remove-unused-annotations

Remove deprecated annotations.
Merge pull request #1380 from erd/fix-issue-1251

Set ro.build.date.utc in ShadowSystemProperties.