dev-perl/DBD-mysql: Bump to version 4.42.0 re bug #604678

dev-perl/DBD-mysql: Bump to version 4.42.0 re bug #604678

Upstream:
- Fix encoding of input statements with mysql_enable_utf8 and
  mysql_enable_utf8mb4
- Set UTF-8 flag for decoded data
- Return INTs with ZEROFILL as strings
- Statement handle how has mysql_sock attribute
- Fixed type conversions for magic types
- Fix UTF8 encoding of table/field names and warnings/errors
- Fix mysql_auto_reconnect with mysql_server_prepare
- Improve regex for removing database from dsn
- Locate libmysql with Devel::CheckLib
- Support async on windows
- Fix tests against older Mysql/Mariadb
- Fix compilation with Mysql 4.1
- Don't leak dangling pointer to mysql result
- Fix logic assigning to variable bind_comment_placeholders
- fix mysql_fd returning fd after connection closed.
- Fix parsing configure libs from mysql_config
- Fix support for magic scalars

Keywording:
- New dependencies necessitate dropping:
  ia64 mips ppc64 sparc x86-fbsd

Bug: https://bugs.gentoo.org/604678
Package-Manager: Portage-2.3.4, Repoman-2.3.2