Small QA fixes based on Lintian reports

debian/libmariadbclient-dev.lintian-overrides

-# OK, newer Debian should support xz
-libmariadbclient-dev: data.tar.xz-member-without-dpkg-pre-depends

debian/libmariadbclient18.lintian-overrides

@@ -3,6 +3,3 @@ libmariadbclient18: arch-dependent-file-not-in-arch-specific-directory usr/lib/m
 libmariadbclient18: arch-dependent-file-not-in-arch-specific-directory usr/lib/mysql/plugin/mysql_clear_password.so
 # embedded libs are OK
 libmariadbclient18: embedded-library usr/lib/x86_64-linux-gnu/libmariadbclient.so.18.0.0: libmysqlclient
-libmariadbclient18: embedded-library usr/lib/i386-linux-gnu/libmariadbclient.so.18.0.0: libmysqlclient
-# OK, newer Debian should support xz
-libmariadbclient18: data.tar.xz-member-without-dpkg-pre-depends

debian/libmariadbd-dev.lintian-overrides

@@ -3,8 +3,6 @@ libmariadbd-dev: package-name-doesnt-match-sonames libmysqld18
 # OK to have embedded from same source
 libmariadbd-dev: embedded-library usr/lib/x86_64-linux-gnu/libmysqld.so.18: libmysqlclient
 libmariadbd-dev: embedded-library usr/lib/i386-linux-gnu/libmysqld.so.18: libmysqlclient
-# OK, newer Debian should support xz
-libmariadbd-dev: data.tar.xz-member-without-dpkg-pre-depends
 # OK, this is in fact a dev package
 # but for soname libmysqlclient
 # (due to upstream reasons)

debian/mariadb-client-5.5.lintian-overrides

@@ -4,5 +4,3 @@ mariadb-client-5.5: embedded-library usr/bin/mysqldump: libmysqlclient
 mariadb-client-5.5: embedded-library usr/bin/mysqlimport: libmysqlclient
 mariadb-client-5.5: embedded-library usr/bin/mysqlshow: libmysqlclient
 mariadb-client-5.5: embedded-library usr/bin/mysqlslap: libmysqlclient
-# OK, newer Debian should support xz
-mariadb-client-5.5: data.tar.xz-member-without-dpkg-pre-depends

debian/mariadb-client-core-5.5.lintian-overrides

 # these libs are OK
 mariadb-client-core-5.5: embedded-library usr/bin/mysql: libmysqlclient
 mariadb-client-core-5.5: embedded-library usr/bin/mysqlcheck: libmysqlclient
-# OK in newer Debian, includes support for xz
-mariadb-client-core-5.5: data.tar.xz-member-without-dpkg-pre-depends

debian/mariadb-client.lintian-overrides

-# OK in newer Debian, includes support for xz
-mariadb-client: data.tar.xz-member-without-dpkg-pre-depends
-

debian/mariadb-common.lintian-overrides

-# OK in newer Debian, includes support for xz
-mariadb-common: data.tar.xz-member-without-dpkg-pre-depends

debian/mariadb-server-5.5.lintian-overrides

 # Embedded from same source is OK
 mariadb-server-5.5: embedded-library usr/bin/mysqlbinlog: libmysqlclient
-# OK in neẃer Debian, includes support for xz
-mariadb-server-5.5: data.tar.xz-member-without-dpkg-pre-depends
 # ash's buildin has no "-e" so use /bin/echo
 mariadb-server-5.5: command-with-path-in-maintainer-script postinst:194 /bin/echo
 mariadb-server-5.5: command-with-path-in-maintainer-script postinst:208 /bin/echo

debian/mariadb-server-5.5.manpages

@@ -15,6 +15,7 @@ debian/tmp/usr/share/man/man1/mysqld_multi.1
 debian/tmp/usr/share/man/man1/mysqld_safe.1
 debian/tmp/usr/share/man/man1/mysqlhotcopy.1
 debian/tmp/usr/share/man/man1/mysql_install_db.1
+debian/tmp/usr/share/man/man1/mysql_plugin.1
 debian/tmp/usr/share/man/man1/mysql_secure_installation.1
 debian/tmp/usr/share/man/man1/mysql_setpermission.1
 debian/tmp/usr/share/man/man1/mysql_tzinfo_to_sql.1

debian/mariadb-server-core-5.5.lintian-overrides

 # Embedded with same source OK
 mariadb-server-core-5.5: embedded-library usr/sbin/mysqld: libmysqlclient
-# OK in newer Debian, includes support for xz
-mariadb-server-core-5.5: data.tar.xz-member-without-dpkg-pre-depends

debian/mariadb-server.lintian-overrides

-# OK in newer Debian, includes support for xz
-mariadb-server: data.tar.xz-member-without-dpkg-pre-depends

debian/mariadb-test-5.5.lintian-overrides

-# in modern Debian this xz support exists, this should not matter anymore
-mariadb-test-5.5: data.tar.xz-member-without-dpkg-pre-depends
 # Embedded from same source is OK
 mariadb-test-5.5: embedded-library usr/bin/mysql_client_test: libmysqlclient
 mariadb-test-5.5: embedded-library usr/bin/mysql_client_test_embedded: libmysqlclient
@@ -7,3 +5,5 @@ mariadb-test-5.5: embedded-library usr/bin/mysqltest: libmysqlclient
 mariadb-test-5.5: embedded-library usr/bin/mysqltest_embedded: libmysqlclient
 # OK, file part of test suite
 mariadb-test-5.5: arch-dependent-file-in-usr-share usr/share/mysql/mysql-test/lib/My/SafeProcess/my_safe_process
+# This file is designed to run with 'perl checksum.pl' and is not possible to run directly
+mariadb-test-5.5: script-not-executable usr/share/mysql/mysql-test/suite/rpl/extension/checksum.pl

debian/mariadb-test.lintian-overrides

-# in modern Debian this xz support exists, this should not matter anymore
-mariadb-test: data.tar.xz-member-without-dpkg-pre-depends