Get ICU 4.6 to be compiled without RTTI....

third_party/icu/source/i18n/basictz.cpp

Index: third_party/icu/source/i18n/basictz.cpp
===================================================================
--- third_party/icu/source/i18n/basictz.cpp	(revision 74230)
+++ third_party/icu/source/i18n/basictz.cpp	(working copy)
@@ -395,7 +395,7 @@
         if (done[i]) {
             continue;
         }
-        const TimeArrayTimeZoneRule *tar = dynamic_cast<const TimeArrayTimeZoneRule *>(toRule);
+        const TimeArrayTimeZoneRule *tar = CR_DYNAMIC_CAST<const TimeArrayTimeZoneRule *>(toRule);
         const AnnualTimeZoneRule *ar;
         if (tar != NULL) {
             // Get the previous raw offset and DST savings before the very first start time
@@ -466,7 +466,7 @@
                     }
                 }
             }
-        } else if ((ar = dynamic_cast<const AnnualTimeZoneRule *>(toRule)) != NULL) {
+        } else if ((ar = CR_DYNAMIC_CAST<const AnnualTimeZoneRule *>(toRule)) != NULL) {
             ar->getFirstStart(tzt.getFrom()->getRawOffset(), tzt.getFrom()->getDSTSavings(), firstStart);
             if (firstStart == tzt.getTime()) {
                 // Just add the rule as is