Beta and release channel of Android still turn off ICU. So we should add UTF-8 version of nsICollation for fallback.
Some people want to keep --enale-intl-api=no for faster build on developer environment, so even if non-Android, it will be required.
MozReview-Commit-ID: 3RcjqoVip1W
--HG--
rename : intl/locale/unix/nsCollationUnix.cpp => intl/locale/nsCollationAndroid.cpp
extra : rebase_source : 6844f32efe8c37b020f30bc745d4d4d8e95c4158
Makoto Kato