v20.20.1
doc: create maintaining folder for deps
deps: update icu to 78.2
build, deps, tools: avoid excessive LTO
build: fix --with-intl=system-icu for x-compile
deps: enable unit data in small-icu
deps: bump minimum ICU version to 71
tools: fix undeclared identifier FALSE
tools: allow icutrim.py to run on python2
build, i18n: improve Intl build, add "--with-intl"
tools: automate icu-small update