Add support for Daitch-Mokotoff Soundex in contrib/fuzzystrmatch.

This modernized version of Soundex works significantly better than
the original, particularly for non-English names.

Dag Lem, reviewed by quite a few people along the way

Discussion: https://postgr.es/m/yger1atbgfy.fsf@sid.nimrod.no

contrib/fuzzystrmatch/meson.build

@@ -1,10 +1,19 @@
 # Copyright (c) 2022-2023, PostgreSQL Global Development Group
 
 fuzzystrmatch_sources = files(
-  'fuzzystrmatch.c',
+  'daitch_mokotoff.c',
   'dmetaphone.c',
+  'fuzzystrmatch.c',
 )
 
+daitch_mokotoff_h = custom_target('daitch_mokotoff',
+  input: 'daitch_mokotoff_header.pl',
+  output: 'daitch_mokotoff.h',
+  command: [perl, '@INPUT@', '@OUTPUT@'],
+)
+generated_sources += daitch_mokotoff_h
+fuzzystrmatch_sources += daitch_mokotoff_h
+
 if host_system == 'windows'
   fuzzystrmatch_sources += rc_lib_gen.process(win32ver_rc, extra_args: [
     '--NAME', 'fuzzystrmatch',
@@ -13,6 +22,7 @@ endif
 
 fuzzystrmatch = shared_module('fuzzystrmatch',
   fuzzystrmatch_sources,
+  include_directories: include_directories('.'),
   kwargs: contrib_mod_args,
 )
 contrib_targets += fuzzystrmatch
@@ -21,6 +31,7 @@ install_data(
   'fuzzystrmatch.control',
   'fuzzystrmatch--1.0--1.1.sql',
   'fuzzystrmatch--1.1.sql',
+  'fuzzystrmatch--1.1--1.2.sql',
   kwargs: contrib_data_args,
 )
 
@@ -31,6 +42,7 @@ tests += {
   'regress': {
     'sql': [
       'fuzzystrmatch',
+      'fuzzystrmatch_utf8',
     ],
   },
 }