Require ICU 55 or later

Support for older versions is removed.  Since we no longer support
RHEL 7, we don't need to support these old versions anymore.  This
allows a fair amount of code cleanup, including some code blocks that
specifically catered to old versions that probably received very
little actual testing and use.

Reviewed-by: Jelte Fennema-Nio <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/flat/ca+hukgl7trhwij4qxpksbztmmtwdypnp1qn+lq341v7ql77...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/4854b2373c738a3e2fe5a46c2667d908f7c7e13a

Modified Files
--------------
configure                             | 22 ++++-----
configure.ac                          |  2 +-
doc/src/sgml/installation.sgml        | 14 +++---
meson.build                           |  4 +-
src/backend/utils/adt/pg_locale_icu.c | 84 ++++++-----------------------------
5 files changed, 35 insertions(+), 91 deletions(-)

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