www/node4: unbreak with ICU >= 59

../deps/v8/src/runtime/runtime-i18n.cc:587:3: error: no member named 'Normalizer' in namespace 'icu'; did you mean 'UNormalizer2'?

icu::Normalizer::normalize(u_value, normalizationForms[form_id], 0, result,
^~~~~~~~~~~~~~~
UNormalizer2

/usr/local/include/unicode/unorm2.h:119:29: note: 'UNormalizer2' declared here
typedef struct UNormalizer2 UNormalizer2; /**< C typedef for struct UNormalizer2. @stable ICU 4.4 */

^

../deps/v8/src/runtime/runtime-i18n.cc:587:8: error: incomplete type 'UNormalizer2' named in nested name specifier

icu::Normalizer::normalize(u_value, normalizationForms[form_id], 0, result,
~~~~~^~~~~~~~~~~~

/usr/local/include/unicode/unorm2.h:118:8: note: forward declaration of 'UNormalizer2'
struct UNormalizer2;

^

PR: 222224