mariadb: bump to major version 10.4

Highlights:

- Bump from 10.2.26 to 10.4.10
- auth_pam got replaced with never version, old one still available as
  auth_pam_v1
- semisync plugins were merged into the core
- Upstream now installs symlinks for binaries with mariadb prefix. To
  accommodate that this commit updates Package/mariadb/install/bin
  accordingly.
- Patches are updated with new ones from Debian and Arch (thanks!)
- libedit patch dropped because it's upstream now.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

utils/mariadb/patches/180-relax-mysql_install-db-wrt-pam-tool.patch

@@ -0,0 +1,39 @@
+--- a/scripts/mysql_install_db.sh
++++ b/scripts/mysql_install_db.sh
+@@ -359,6 +359,14 @@ then
+     exit 1
+   fi
+   plugindir=`find_in_dirs --dir auth_pam.so $basedir/lib*/plugin $basedir/lib*/mysql/plugin $basedir/lib/*/mariadb19/plugin`
++  # Upstream assumes all plugins will be always installed, but in OpenWrt we can
++  # install a server without plugins if we want to.
++  if test -z "$plugindir"
++  then
++    echo "Could not find plugin directory." >&2
++    echo "Will continue with \"/usr/lib/mariadb/plugin\"." >&2
++    plugindir=/usr/lib/mariadb/plugin
++  fi
+   pamtooldir=$plugindir
+ # relative from where the script was run for a relocatable install
+ elif test -n "$dirname0" -a -x "$rel_mysqld" -a ! "$rel_mysqld" -ef "@sbindir@/mysqld"
+@@ -478,7 +486,9 @@ do
+   fi
+ done
+ 
+-if test -n "$user"
++# There should be no need for this on OpenWrt. If this turns out to be a wrong guess then
++# we can revisit.
++if test -n ""
+ then
+   chown $user "$pamtooldir/auth_pam_tool_dir" && \
+   chmod 0700 "$pamtooldir/auth_pam_tool_dir"
+@@ -499,6 +509,10 @@ then
+         echo
+     fi
+   fi
++fi
++
++if test -n "$user"
++then
+   args="$args --user=$user"
+ fi
+