Build shared ICU data file(icudt.dll) for windows using gyp file

[Harsh Gupta]

We've found an issue where the pre-built ICU data file (icudt.dll) is of ICU version 56, and the v8 binaries are getting built with ICU version 58.

Please take a look at version of: https://chromium.googlesource.com/chromium/deps/icu/+/450be73c9ee8ae29d43d4fdc82febb2a5f62bfb5/windows/icudt.dll and https://chromium.googlesource.com/chromium/deps/icu/+/450be73c9ee8ae29d43d4fdc82febb2a5f62bfb5/source/common/unicode/uvernum.h#61. Former is pre-built binary of version 56, and latter corresponds to ICU 58, and this is causing failure in v8::V8::InitializeICU()

Please tell how can we build the ICU shared data file using GYP?

Thanks!

Harsh