Issue #1451 - Split out ICU data file on Windows

This reduces the xul.dll size by 11 MB

build/autoconf/icu.m4

@@ -38,7 +38,7 @@ if test -n "$USE_ICU"; then
     dnl We also don't do it on Windows because sometimes the file goes
     dnl missing -- possibly due to overzealous antivirus software? --
     dnl which prevents the browser from starting up :(
-    if test -z "$JS_STANDALONE" -a "$OS_TARGET" != WINNT -a "$MOZ_WIDGET_TOOLKIT" != "android"; then
+    if test -z "$JS_STANDALONE"; then
         MOZ_ICU_DATA_ARCHIVE=1
     else
         MOZ_ICU_DATA_ARCHIVE=