Log Message:
textproc/icu: updated to 61.1

61.1:
Common Changes
* CLDR 33:
  - Two additional locales (Odia, Assamese) were brought up to Modern coverage level.
  - 4 new transforms: fa-fa_FONIPA, ha-ha_NE, nv-nv_FONIPA, vec-vec_FONIPA.
  - New currency code MRU for Mauritania.
  - Arabic native vs. ASCII digits.
  - Data additions & bug fixes.
* Many small API additions, improvements, and bug fixes.

ICU4C Specific Changes
* Added Google double-conversion library for formatting doubles. This is the \ 
library used in V8 and a number of other projects for converting doubles to \ 
decimals. To avoid name collisions, the library is linked internally under the \ 
ICU namespace as icu::double_conversion. Our copy of double_conversion is not \ 
intended for public usage.
* Re-wrote U8_NEXT macros to eliminate all library function calls.