build: use ICU_UTIL_DATA_STATIC across V8

ICU_UTIL_DATA_SHARED had been removed since
https://crrev.com/c/1513615, but Node.js still defined
it and relied on the removed path on Windows, so the ICU
initialization in mksnapshot had been silently failing
since then. https://crrev.com/c/7679153 made the failure
visible so the build started breaking on Windows. Fix it
by always using ICU_UTIL_DATA_STATIC since we already compile
the ICU data statically in.

Signed-off-by: Joyee Cheung <joyeec9h3@gmail.com>

Author: joyeecheung

tools/v8_gypfiles/v8.gyp

@@ -1350,13 +1350,7 @@
             ['icu_use_data_file_flag', {
               'defines': ['ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_FILE'],
             }, {
-               'conditions': [
-                 ['OS=="win"', {
-                   'defines': ['ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_SHARED'],
-                 }, {
-                    'defines': ['ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_STATIC'],
-                  }],
-               ],
+              'defines': ['ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_STATIC'],
              }],
             ['OS=="win"', {
               'dependencies': [