Enable i18n support on AIX

[mtbrandy]

The upstream changes from 3.20.17 to 3.22.24 turned on i18n support by default. This is causing build problems for AIX.

Disabling via the i18nsupport=off works around the problem, but this needs further investigation.

[richardlau]

V8 is using a customized version of ICU 4.6 that is exported from http://src.chromium.org/chrome/trunk/deps/third_party/icu46/. The readme file, http://src.chromium.org/svn/trunk/deps/third_party/icu46/README.chromium, details the customizations made -- It looks like we'd at least need a platform header file (point 2) and most probably a pre-built data library (point 11) for AIX.

[richardlau]

Looks like the data libraries are endian specifc: http://userguide.icu-project.org/icudata#TOC-Sharing-ICU-Data-Between-Platforms

The pre-built data libraries in http://src.chromium.org/chrome/trunk/deps/third_party/icu46/ are all little endian (given the naming convention -- they all end with 'l') so we are going to have to generate a big endian set for AIX (and Linux ppc).