Enable ICU support

[GoogleCodeExporter]

Full ICU support will not be possible until we deal with issue 266, but we can 
implement stubs. 38 will have a stub normalize() that should be sufficient to 
fix Zotero.

Original issue reported on code.google.com by classi...@floodgap.com on 2 Jul 2015 at 3:48

• Blocked on: implement ICU shared machinery when it becomes mandatory #266

[classilla]

This can be done with either the early patches from https://bugzilla.mozilla.org/show_bug.cgi?id=926980 or turning on MOZ_SHARED_ICU which will still be supported in 45. The latter is much simpler.

[classilla]

MOZ_SHARED_ICU it is.