MDEV-6284: Correctly place files in libmariadb-dev, libmariadbd-dev etc packages

- Make full contents, also header files, explicit in -dev packages
  fb77df0c75
- Don't ship private header files at all.
- Ship both libmariadb.pc and maridb.pc.
- Ship mysql_config only as a symlink.
- Keep 'mariadbcheck' as symlink as somebody could have used it already
  d0466f74d5
- The mariadb.pc is the server pkg-config, ship in libmariadbd-dev.
- The client pkg-config is called libmariadb.pc. Ship only it in the client
  library packages.

Use versioned breaks/replaces for mysql* packages we also provide and fix:

  [ERROR] libmariadb-dev conflicts with libmysqlclient-dev files:
    {'/usr/share/man/man1/mysql_config.1.gz', '/usr/share/aclocal/mysql.m4'}
  [ERROR] libmariadb-dev conflicts with libmysqld-dev files:
    {'/usr/lib/x86_64-linux-gnu/libmysqlservices.a'}

debian/libmariadb-dev.install

@@ -1,11 +1,33 @@
 usr/bin/mariadb_config
-usr/include/mariadb
+usr/include/mariadb/errmsg.h
+usr/include/mariadb/ma_list.h
+usr/include/mariadb/ma_pvio.h
+usr/include/mariadb/ma_tls.h
+usr/include/mariadb/mariadb/
+usr/include/mariadb/mariadb/ma_io.h
+usr/include/mariadb/mariadb_com.h
+usr/include/mariadb/mariadb_ctype.h
+usr/include/mariadb/mariadb_dyncol.h
+usr/include/mariadb/mariadb_rpl.h
+usr/include/mariadb/mariadb_stmt.h
+usr/include/mariadb/mariadb_version.h
+usr/include/mariadb/my_config.h
+usr/include/mariadb/my_global.h
+usr/include/mariadb/my_sys.h
+usr/include/mariadb/mysql.h
+usr/include/mariadb/mysql/
+usr/include/mariadb/mysql/client_plugin.h
+usr/include/mariadb/mysql/plugin_auth.h
+usr/include/mariadb/mysql/plugin_auth_common.h
+usr/include/mariadb/mysql_com.h
+usr/include/mariadb/mysql_version.h
+usr/include/mariadb/mysqld_error.h
 usr/lib/*/libmariadb.a
 usr/lib/*/libmariadb.so
 usr/lib/*/libmariadbclient.a
 usr/lib/*/libmariadbclient.so
 usr/lib/*/libmysqlservices.a
-usr/lib/*/pkgconfig/mariadb.pc
+usr/lib/*/pkgconfig/libmariadb.pc
 usr/share/aclocal/mysql.m4
 usr/share/man/man1/mariadb_config.1
 usr/share/man/man1/mysql_config.1