What's new in ICU 61.1:
  - CLDR 33 (locale data; http://cldr.unicode.org/index/downloads/cldr-33 )
  - A new number formatting API
  - Rewrote U8_NEXT
  - See http://site.icu-project.org/download/61 for more details.

The update steps are recorded in
  https://chromium.googlesource.com/chromium/deps/icu/+log/f7ab784..b0e0b84

On top of the above, IANA timezone db was updated once more to the
latest 2018e (released on May 4th).

The list of local changes are:

* Update the currency list. For desktop, include all the national
  currencies (see https://bugs.chromium.org/p/v8/issues/detail?id=7472 )

* Clean up disabled warning list in BUILD.gn/icu.gyp

* Fix clang on Windows and MSVC build failures
  https://github.com/google/double-conversion/issues/66
  http://bugs.icu-project.org/trac/ticket/13752
  http://bugs.icu-project.org/trac/ticket/13750

* Rebuild the data files
   Size is reduced by ~100kB for non-desktop.
   Desktop(common): increase by 90kB

    6,386,176 android/icudtl.dat  (6,502,048)
    4,929,248 cast/icudtl.dat     (5,032,368)
   10,264,208 common/icudtl.dat  (10,171,920)
    6,372,480 ios/icudtl.dat      (6,488,384)

* Update IANA tz DB to 2018e

* Update README.chromium

* Drop patches that became unnecessary.

* Apply the remaining patches

   Isvalidenum.patch, simplify_smallintformatter.patch,
   word_long.patch, locid_map.patch

* Apply data-build related patches

  {wpo,vscomp,data.build,data.build.win,data_symb}.patch

* Apply BreakIterator related patches + locale1 patch

* Apply Google's patch for locale data

* ICU 61.1 update step 1

  Check in ICU 61.1 to the tree (61staging branch) by
  running scripts/update.sh.
  Build files are updated by the script.

* Update prep

TBR=thakis@chromium.org
Bug: 838383
Test: None
Change-Id: Ib83ed624fe764abdb7fbfd567ae5e982497089bd
Reviewed-on: https://chromium-review.googlesource.com/1041578


Reviewed-by: Jungshik Shin <jshin@chromium.org>