Fix LatinIME's ProGuard config for support libs using flags copied from Email app.

-keep class com.android.inputmethod.keyboard.MoreKeysKeyboard$Builder$MoreKeysKeyboardParams {

  <init>(...);

}

# The support library contains references to newer platform versions.

# Don't warn about those in case this app is linking against an older

# platform version.  We know about them, and they are safe.

-dontwarn android.support.v4.**

-dontwarn android.support.v13.**