math/libqalculate: unbreak with ICU 63

In file included from Calculator.cc:45:
In file included from /usr/local/include/unicode/ucasemap.h:25:
/usr/local/include/unicode/localpointer.h:221:40: error: expected ';' at end of declaration list

LocalPointer(LocalPointer<T> &&src) U_NOEXCEPT : LocalPointerBase<T>(src.ptr) {
                                   ^

/usr/local/include/unicode/localpointer.h:366:36: error: expected ';' at end of declaration list

LocalArray(LocalArray<T> &&src) U_NOEXCEPT : LocalPointerBase<T>(src.ptr) {
                               ^

In file included from Calculator.cc:45:
/usr/local/include/unicode/ucasemap.h:96:1: error: expected ';' at end of declaration list
U_DEFINE_LOCAL_OPEN_POINTER(LocalUCaseMapPointer, UCaseMap, ucasemap_close);
^
/usr/local/include/unicode/localpointer.h:493:60: note: expanded from macro 'U_DEFINE_LOCAL_OPEN_POINTER'

LocalPointerClassName(LocalPointerClassName &&src) U_NOEXCEPT \
                                                   ^

/usr/local/include/unicode/platform.h:503:23: note: expanded from macro 'U_NOEXCEPT'

1. define U_NOEXCEPT noexcept ^

Regressed by: https://github.com/unicode-org/icu/commit/35ce5296c1d3
PR: 232300
Reported by: antoine (via exp-run)