[dev-db/mysql] added last 5.7 for short-term usage (hopefully)

test suite not run yet, but builds and works

dev-db/mysql/Manifest

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+DIST mysql-5.7.36-patches-01.tar.xz 6396 BLAKE2B ed9783f207d40fc220992c4193bdd8e96523f69414daa756f1f30306c1aedff9e96216ba2294a4c41eefbaf39c8bb37784bf1e7cce656c93f829c9cf0682fa6d SHA512 b0fbd41ebb2d32067e6c81707dffa91fece2d368f4b2fa47951492936509972d425b64d7613748c42b31cf9ba9dab697efeff70debe7268855a90d322d3f3158
+DIST mysql-boost-5.7.44.tar.gz 53298645 BLAKE2B 3f5e6a0ca77cf9da212d01d4856b9e1cce453a81622fa91e5f62ac0c23678c624f51cf8844e7fe6a505231ed6567470ce987af9d2bff15057ec174ead1635c86 SHA512 371b641e622321419ad875662f2b80a255d3059a6cbae40868447b0e4b70b2dccc9bdb227800d719d4f66857aed458e8a843c3095bf64cef5e5b92b7c0234b6b

dev-db/mysql/files/my.cnf-5.7

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+# @GENTOO_PORTAGE_EPREFIX@/etc/mysql/my.cnf: The global mysql configuration file.
+
+!includedir @GENTOO_PORTAGE_EPREFIX@/etc/mysql/mysql.d

dev-db/mysql/files/my.cnf.distro-client

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+# @GENTOO_PORTAGE_EPREFIX@/etc/mysql/50-distro-client.cnf: The global mysql configuration file.
+
+# The following options will be passed to all MySQL clients
+[client]
+socket						= @GENTOO_PORTAGE_EPREFIX@/var/run/mysqld/mysqld.sock
+character-sets-dir				= @GENTOO_PORTAGE_EPREFIX@/usr/share/mysql/charsets
+loose-default-character-set=utf8
+
+[mysql]
+# uncomment the next directive if you are not familiar with SQL
+#safe-updates
+
+[mysqldump]
+quick
+max_allowed_packet			= 16M
+
+[myisamchk]
+character-sets-dir=@GENTOO_PORTAGE_EPREFIX@/usr/share/mysql/charsets
+
+[myisampack]
+character-sets-dir=@GENTOO_PORTAGE_EPREFIX@/usr/share/mysql/charsets

dev-db/mysql/files/my.cnf.distro-server

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+# @GENTOO_PORTAGE_EPREFIX@/etc/mysql/50-distro-server.cnf: The global mysql configuration file.
+
+# add a section [mysqld-4.1] or [mysqld-5.0] for specific configurations
+[mysqld]
+character-set-server				= utf8
+user						= mysql
+port						= 3306
+socket						= @GENTOO_PORTAGE_EPREFIX@/var/run/mysqld/mysqld.sock
+pid-file					= @GENTOO_PORTAGE_EPREFIX@/var/run/mysqld/mysql.pid
+log-error					= @GENTOO_PORTAGE_EPREFIX@/var/log/mysql/mysqld.err
+basedir						= @GENTOO_PORTAGE_EPREFIX@/usr
+datadir						= @DATADIR@
+skip-external-locking
+lc_messages_dir					= @GENTOO_PORTAGE_EPREFIX@/usr/share/mysql
+#Set this to your desired error message language
+lc_messages					= en_US
+
+# security:
+# using "localhost" in connects uses sockets by default
+# skip-networking
+bind-address					= 127.0.0.1
+
+log-bin
+server-id					= 1
+
+# point the following paths to different dedicated disks
+tmpdir						= @GENTOO_PORTAGE_EPREFIX@/tmp/
+#log-update					= @GENTOO_PORTAGE_EPREFIX@/path-to-dedicated-directory/hostname